Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a2a586628ef65d…

MALICIOUS

PDF

87.2 KB Created: 2021-03-09 14:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03f76b424431cf4275c4e05db53b4a0c SHA-1: a7993ffe2a04b05a72acb69326b97628184b7f17 SHA-256: 67a2a586628ef65dc88bae438d9a36e4ee9bb1eb0dff6f1baa069ba81bbea798
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was identified as a link farm containing a large number of external URLs, with several pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the presence of numerous external links suggests a redirection mechanism to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/aws?utm_term=ryobi+hbt-255l+table+saw+%25281500w%2529+review PDF link annotation
    • http://dalidusiz.mywebcommunity.org/tubakosex.pdfIn PDF document text
    • https://zitidimesefe.weebly.com/uploads/1/3/1/6/131606065/reresedimafuvomi.pdfIn PDF document text
    • https://wuwabisa.weebly.com/uploads/1/3/1/6/131606234/7b77562d3ba.pdfIn PDF document text
    • https://rosajojuzexoked.weebly.com/uploads/1/3/0/8/130874599/dobomigulasukibite.pdfIn PDF document text
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/7cce5c9d32d869.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/50f8afed61.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/what_is_diploma_in_supply_chain_management.pdfIn PDF document text
    • https://giduwuxudi.weebly.com/uploads/1/3/4/7/134716719/rojajuge_jofuwifewibofal_kisupa_burisosivazoz.pdfIn PDF document text
    • https://bipejazikapidim.weebly.com/uploads/1/3/4/5/134529651/gopozefig.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/zupusolak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/26fb03ef-f0d9-4654-831d-9264960d6093/how_much_does_a_polaris_1000_cost.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_32868a2ada424f7eaaac2ac290f2b64f.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_500167f55cd9411dba899e5506155ef3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59bbaa79-8d77-4fa7-86a3-4d249261fab5/53102243661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ca25b4-5599-4877-bd35-986dd80b0db6/how_many_pages_are_in_the_book_diary_of_a_wimpy_kid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ffb7db-91d2-4dcd-8a7d-505a26025e5f/84740251072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e955867a-d66e-440c-867a-fec4275a2ad5/microsoft_wireless_keyboard_2000_power_button.pdfIn PDF document text
    • http://fepetixapokurob.myartsonline.com/56969887807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d2c95b-8a94-4c22-930c-9169da1142ce/fojitolabovatenesoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e14c46-c87d-42e9-b0d4-92b8b235ae39/mojelugurawug.pdfIn PDF document text
    • http://josesomesube.myartsonline.com/how_to_reorder_pages_in_adobe_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f0c64b-68a2-491e-bdf0-0d2fd7ad5c31/32034635277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85669ac-3316-4765-87af-413ab83971ac/rilebewoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5eeb16-128b-449a-ab7e-c8da1339de9d/anet_a6_firmware_v2.0_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 5492 bytes
SHA-256: 48b8bf8bd80e9b582e5f4e7e1dc2bde36e942e4b47df4c10ab44f9da5686b57e
font_01_sfnt_off00010e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 11344 bytes
SHA-256: d5fa207564123214e1a350d5a3980b3405691835cafe18d7825361541390c9a8
font_03_sfnt_off0001409b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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