Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce13ffee7a1d52a…

MALICIOUS

PDF

66.0 KB Created: 2021-03-21 21:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 39af31c1c90d4945a43cc1298f738a88 SHA-1: 5fa710486c4c3864ee0ea44709b4f413aa30e651 SHA-256: 6ce13ffee7a1d52a7a1813b97468fccc3440e67dc4b8521051378e3eafe8756e
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 0.9997

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://xajibur.ru/strik?utm_term=magnavox+astro+sonic+stereo+high+fidelity PDF link annotation
    • https://lefimofutab.weebly.com/uploads/1/3/4/3/134330763/gibosozo.pdfIn PDF document text
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/miwekivixalu.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/a2073e.pdfIn PDF document text
    • https://mavipevawifuduv.weebly.com/uploads/1/3/4/5/134598931/xojimu.pdfIn PDF document text
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/561f813bb8a7.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/9607313.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/lotuwovo.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/pizigamatala.pdfIn PDF document text
    • https://mokekisinuru.weebly.com/uploads/1/3/4/3/134366850/272de4f80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_5530747c122942b39fe91cc0e64c87cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/849d89d6-98bf-4e7f-9725-6f9301c25dac/jojukopekusemuja.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/kakupejabubabavufularada.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/71451534354.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/string_cheese_stick_nutrition_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd74eb97-a810-4653-8978-dfc93b4e429c/telugu_short_stories_with_moral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a936e7b-38b6-4c72-9837-64fbc3c6b2aa/2002_dodge_ram_2500_aftermarket_parts.pdfIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_130523d5d1c64f2f8afc23ecca5f987c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3486fcb3-3b25-44b1-a7ce-569eec62000c/godrej_refrigerator_models_with_price_list_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/91049915805.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_0aed04f81162496d820fcd19e524a0b3.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_c232310c627d4502af03a186b7499f48.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_off0000c666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 5520 bytes
SHA-256: 174eeb959681da4a4e93d219a32513c4c6d6f7530d6fe1de951a519bd1f9a770
font_01_sfnt_off0000d946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD946 9756 bytes
SHA-256: df83e8fa9c3b17d9952f074c1901cf3c47af8a3565aa18cbef6fca6f50239eb1