Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc4bc9a1b0de4e9…

MALICIOUS

PDF

79.6 KB Created: 2021-06-08 00:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2fc8d065c5e72b11bad87720af944088 SHA-1: 17ea4a8b70a278bcd54b8703b766f03e1537e550 SHA-256: dfc4bc9a1b0de4e940fe5cd3837a2e2e83428625e0786c615276b0cf60274fd4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://huntic.ru/pbw?utm_term=what+do+oak+trees+symbolize PDF link annotation
    • https://konatewed.weebly.com/uploads/1/3/4/6/134692195/lorepiroke-baroxipogoz-peliwubiriga-buluriwivurefu.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/xibojan-jalewizumuda-pevonadobo.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/4c5538.pdfIn PDF document text
    • https://sovomebidug.weebly.com/uploads/1/3/1/3/131379042/d7b53d9b1e9.pdfIn PDF document text
    • https://javofosuzuvenew.weebly.com/uploads/1/3/4/5/134588543/murab-jukafodabile.pdfIn PDF document text
    • https://sararilaba.weebly.com/uploads/1/3/1/4/131482808/e3a26aa.pdfIn PDF document text
    • https://tukajolikapuz.weebly.com/uploads/1/3/5/3/135346043/jopafodibo.pdfIn PDF document text
    • https://neluposu.weebly.com/uploads/1/3/4/3/134369170/6301715.pdfIn PDF document text
    • https://zelezolure.weebly.com/uploads/1/3/4/3/134315846/wimulapagabibot-telezixe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd6e896-ff26-40fb-8846-f2fd00e9c2a3/how_to_write_a_resume_summary_with_no_job_experience.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/how_to_buy_a_penny_stock_on_fidelity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7aa0ae-a03b-4897-bdf9-383db904d0ac/cgp_ks3_chemistry_workbook_answers.pdfIn PDF document text
    • http://nibenaxibot.pbworks.com/f/gawizenefanexatuzobamum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1150d24c-4246-4b7a-bcb6-c77894dbd08a/78691639868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba593b3e-fab9-476c-8e81-804d49a9ec0d/263242416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217ec1a9-789b-470d-b9e0-9fee4186a091/what_is_required_to_be_a_good_public_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b316e8f-c80b-45a7-a1d7-9c7ffcd9ff24/rugorade.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/f/allama_iqbal_book_shikwa_jawab_e_shikwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a506c94d-9cc1-43f2-918a-62c4f93346d5/57101769962.pdfIn PDF document text
    • http://wurutaw.pbworks.com/f/hp_officejet_6700_premium_printhead_missing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1990b2-77f6-4f64-8fe9-860fad74b099/negifoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc2928d-d5d9-43ee-adc1-0df0553b38d2/65537230280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f190acb-5935-4f7e-8916-92cee3673faf/when_you_wish_upon_a_star_piano_arrangement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddbb2dd8-73bc-4fe2-8490-54a73e6be539/tebezadaxifipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b0cde9-f796-4563-9903-022d3943a68a/2020_ya_romance_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c66cf9a8-d38c-4b29-9855-bff2e66d7f22/muxidoguderazelavexuzo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 5432 bytes
SHA-256: 99baf87877dab1b41cf301b1f64b1603939d0f9dcfe2d07b2714ad2dd23f205a
font_01_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 10328 bytes
SHA-256: 44f6b9ce1de95b3177c5675a204326e02c2680ab472c80012da8457327792168