Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1067ef51f9994e9…

MALICIOUS

PDF

82.4 KB Created: 2021-03-15 08:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 63a621a84ca3772ef56feda2c082ea5e SHA-1: 16f5614e9a131d1ce56225f1f630ad36c5f6d5d4 SHA-256: a1067ef51f9994e98dbac0b8dcd840bf911e9dd1af04d5256c39ec30166f5865
196 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses a LOLBin command-execution 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 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://crophysi.ru/strik?utm_term=how+did+napoleon+hill+define+a+mastermind+group PDF link annotation
    • https://cdn.sqhk.co/xobabowiwa/u2ge2nY/xaselasimopuvanejufemi.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/1Ehfhab/sisiwaxowig.pdfIn PDF document text
    • https://cdn.sqhk.co/pododefakes/qjahagc/vector_despicable_me_meme_curly_hair.pdfIn PDF document text
    • https://cdn.sqhk.co/walamalesumi/jf4PhfN/cheap_real_football_helmets.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/rbchgkb/download_epic_astro_story_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jorafulati/hgizF9u/oscar_de_la_renta_green_sweater.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuxopova/YcjaFjb/nails_of_america_kingwood_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/walamalesumi/jf4PhfN/cheaIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_b704daefe53647cb964c85be0d72caa7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/68570061078.pdfIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_dea91115c8f54e09b5ec84dc3bc1d529.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/awesome_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/nhmrc_australian_guidelines_prevention_control_infection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544fc295-92ea-4d3d-9fad-fb0ad15cd0cf/11366344483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62377080-64b2-4c30-b312-a518b22ced6f/9045784810.pdfIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_5a77ff97ee5943afa3c2226d6e023f7b.pdf?index=trueIn macro / runtime command snippet
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_913dc676015a4bbbbf7b1e97b6364c56.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_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 5508 bytes
SHA-256: 4ed60a1245bc588900769b5de639cfcb0a64f04626306ecb039dd80c06b698e2
font_01_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 11336 bytes
SHA-256: 4b60a5432a58235e764379b003482835b069665333f2fb3ae5b3b1786f1726c6

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