Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0441ae3ad98286…

MALICIOUS

PDF

75.1 KB Created: 2021-06-05 19:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6c73268317589846d0f7a713c842ac8f SHA-1: c94029127168b24ab7da40046a22086d66edbd64 SHA-256: 7a0441ae3ad9828698f7668304bbbfd74a0d20af96eed7bda08a3d2b0689eeab
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 0.9994

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://cructi.ru/pbw?utm_term=cute+cat+images+for+whatsapp+dp+hd+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385014/normal_5fec04cc67c5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447916/normal_5fdfa02fb56ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370299/normal_5fdeb380a5678.pdfIn PDF document text
    • https://boxakowomer.weebly.com/uploads/1/3/0/8/130874011/kitujas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403947/normal_604071cad79cc.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4413718/normal_60b3615d3f12b.pdfIn PDF document text
    • https://duzajitoji.weebly.com/uploads/1/3/2/6/132680922/zowovefaw-gopoxitubol-xuwujedarima-gibuturosafaz.pdfIn PDF document text
    • https://dumuwikodopod.weebly.com/uploads/1/3/4/4/134458554/lukadomabikus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_6033a7d8ec3af.pdfIn PDF document text
    • https://waleberof.weebly.com/uploads/1/3/4/3/134385841/jomeperenawusube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_60b96919668d5.pdfIn PDF document text
    • https://vilewufatavak.weebly.com/uploads/1/3/4/5/134585542/jakadoxuraluxomujulo.pdfIn PDF document text
    • https://jezelide.weebly.com/uploads/1/3/0/8/130874318/pabanoribavit-jurazubewil.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4383698/normal_60b0edd4ec8c0.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/b451efd4-420a-4788-80d0-d44cfaf895c8/wenokijaraxekafipifeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629b4f83-b04c-4971-ad4c-52de8b4a898e/niwagataruwawukopojutep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09467299-cf00-4162-a3b9-e0d9dffd4f8c/jigapojotipogajoxozipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/241943c3-21e8-41d6-bb66-400b584d685f/metal_gear_solid_3_platinum_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a9526a-cc31-484d-8b72-f15ccf619db9/are_all_4l60e_transmissions_interchangeable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ae7bbd-0b03-4029-8858-e8ab4e309cf1/1832965331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d5d1a5-6167-4164-a9ee-d276897ce205/18734082531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbbec55b-216e-4aba-a69c-29b79985dcfb/90164893906.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 5564 bytes
SHA-256: e6f2b23341f230d79de5d3c032e086f8ca4cc9a11a713e4517f3cc72a32d01cc
font_01_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 9760 bytes
SHA-256: 1b6a7553b6541142cbe8d9fd0e8775dbad800765ca5f8ea4629373e7fb1a115c
font_02_sfnt_off00010ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e