Malicious PDF — malware analysis report

Static analysis result for SHA-256 11133b12c3ad3f63…

MALICIOUS

PDF

81.1 KB Created: 2021-04-03 09:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ec6149b8099e4491fa850a4ecdfad907 SHA-1: e1b1a324ee9dbfa959aef6e375d8547828514bd2 SHA-256: 11133b12c3ad3f63e13d7c944b4d9083cd7f14318d97b36859f99f24d19116ed
126 Risk Score

Malware Insights

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

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 0.9991

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=how+is+the+economy+right+now+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403820/normal_605136a9f2208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408188/normal_60008890d5bb9.pdfIn PDF document text
    • https://zakutawevuvukug.weebly.com/uploads/1/3/5/9/135970657/9345272.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelemusib/gghhjXL/manomuxaxusazarodobelo.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/4150a77fb44be4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459929/normal_601786d64bbe2.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/eiiq4gd/32528088877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416500/normal_6002d5afd63b0.pdfIn PDF document text
    • https://sowekunozo.weebly.com/uploads/1/3/5/3/135321923/tujubiragowaremu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_602026556bef6.pdfIn PDF document text
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/bajazopufufanolamede.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wutogugej/guzuxuse.pdfIn PDF document text
    • http://nemowuroniru.epizy.com/can_you_use_protein_as_meal_replacement.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_f4ffca4086d442a3b2f8cc5113430d46.pdf?index=trueIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_0ed84bf3073242c0ac4b2df2cf28e241.pdf?index=trueIn PDF document text
    • http://zanadogarup.rf.gd/kofiwotetozevipo.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_44069abe01444ad2bdab149b9621325d.pdf?index=trueIn PDF document text
    • http://nekaxikafixof.epizy.com/32817982263.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/porsche_boxster_s_987_buying_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/william_shakespeare_shall_i_compare_thee_to_a_summers_day_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/82265734575.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/how_to_report_statistics.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_1c7b0cd7d92e4f6790ae799776b5cb11.pdf?index=trueIn PDF document text
    • http://welidigukiru.epizy.com/feketediso.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_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 5400 bytes
SHA-256: 4a1da13d1815415e5601e0fc8bb4cef6b2409102957a0f2c855e3741f989e83e
font_01_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 11120 bytes
SHA-256: 13f9f688f1d3f841f210129764824a419693eb8ecba247bcb71cf95eea450f42