Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11b5b9e62390b8a…

MALICIOUS

PDF

81.3 KB Created: 2021-03-17 11:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a2fbc173ccc75a10cc669d0d6181e192 SHA-1: 73d7d02e7092721b2b62c4d77dc573debbc5cc2d SHA-256: b11b5b9e62390b8af23eca56b126e90b2fe0cdf49faf9e143e8fe91bdca173e0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/123?utm_term=girlfriends+guide+to+divorce+will+season+1 PDF link annotation
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/gijet_jirokine_fenuzatezilexew_xamizukake.pdfIn PDF document text
    • https://nuramovu.weebly.com/uploads/1/3/4/3/134363108/669657.pdfIn PDF document text
    • http://ig-copyrightviolation.com/polaris_sportsman_500_electrical_schematicew5d7.pdfIn PDF document text
    • http://portkamesto.site/hoover_max_extract_77_hose_leakinglizdr.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/LLkPHib/54684970472.pdfIn PDF document text
    • https://safipeta.weebly.com/uploads/1/3/1/4/131408280/c9b2579.pdfIn PDF document text
    • https://cdn.sqhk.co/viwitukaz/3BcUpgd/78102535789.pdfIn PDF document text
    • https://lakogobeza.weebly.com/uploads/1/3/4/0/134096968/0011e342850db6.pdfIn PDF document text
    • http://urott-hu.com/bsc_2nd_year_maths_books_download2hws0.pdfIn PDF document text
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/5409d4eed.pdfIn PDF document text
    • http://idealica-italiaoficial.site/245958301075gr6r.pdfIn PDF document text
    • https://fesubinilare.weebly.com/uploads/1/3/1/8/131856970/57856629ef1b3.pdfIn PDF document text
    • http://opt05.ru/riwovarih6itr.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/0eb4f7853b61e4.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/PvVDjdc/soccer_heads_world_cup_2014_dvadi.pdfIn PDF document text
    • https://cdn.sqhk.co/naxaroja/OhjjhQf/71578959324.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/punufabevumeb.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://s3.amazonaws.com/pigolo/2014_chevy_spark_ls_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/47437804446.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_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 5308 bytes
SHA-256: cabaab70e8a9697fed918944952c5066f16f9d2cb66caba69a03a4ee5d8273ad
font_01_sfnt_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 10760 bytes
SHA-256: 1dc218305e9a6a647d6d09c75a01d2fd82b7b56e7ea63967904339c9f8dcc217
font_02_sfnt_off000129e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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