Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0b02e2513ac11b…

MALICIOUS

PDF

87.6 KB Created: 2021-03-16 23:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 83e3d1bd8f848ef51ceb8076ff4fe3be SHA-1: 9ca60dd654366b1e55a94a1842139fcdec3cd493 SHA-256: db0b02e2513ac11b06a5399a0c632adb384bb53bdbd1023c786fd5bbda87cc02
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The document body is heavily obfuscated and does not provide clear textual clues, but the heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=judgment+side+cases+list PDF link annotation
    • http://xutexukoxobofi.mywebcommunity.org/when_to_remove_infant_insert_in_car_seat_graco.pdfIn PDF document text
    • https://lupomixuliwir.weebly.com/uploads/1/3/4/7/134728854/woduf.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/how_to_heat_up_leftover_alfredo.pdfIn PDF document text
    • http://rumepado.mypressonline.com/wings_of_fire_book_in_telugu_download.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/gepawolaluxavozone.pdfIn PDF document text
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/tozizijovuf.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/pippi_longstocking_cartoon_full_episodes.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/xojukifesifeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_8cb8cc1f343c4c489eab4b6eeb24ae8f.pdf?index=trueIn PDF document text
    • http://penanaras.myartsonline.com/munkres_calculus_on_manifolds_solutions.pdfIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_bfa0435fd53a41dd849c2565bccc7b32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1445eaf-c369-4cf2-b9c8-ea09e5b39f56/tedixebitapuviliwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0dbfcb-2901-4515-bc80-25917285ecb5/vubaravifuwelugeled.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_d7b4dff3262b4acf87cdf85cadbfe8c9.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_9ba94d70a5c443a48720d188c23f7b84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d053c258-6d09-49aa-8cac-28e5fc091736/lidudadajejedivoregefolo.pdfIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_0ba658d07d20437fb32146d896cd18f4.pdf?index=trueIn PDF document text
    • http://wenares.myartsonline.com/fujigasegowamomedu.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_57764840f2ea46c9bf2da2a2637ba550.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_002405a2afbf4dd28d2330489acaec45.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_4ad43b8317e14f52ba96bd0ba8a048fa.pdf?index=trueIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_515080db770345939e59ddcdd62891cb.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 5152 bytes
SHA-256: aac23054dcf829d91aba86406d2d821dbf28137ab352ae9431f9927b38d6f964
font_01_sfnt_off00012b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9D 11080 bytes
SHA-256: b7c171604742a274a2d19c73add02e1780344362c240c8cc1528550a7bd71ac8

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