Malicious PDF — malware analysis report

Static analysis result for SHA-256 155063e9f2f2b38a…

MALICIOUS

PDF

79.9 KB Created: 2021-04-16 14:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 069b2a2f250108c320720ca2dd9fd976 SHA-1: 70fc7eadc415bf082209397735713bf12956b765 SHA-256: 155063e9f2f2b38a6743f7e7745f6d287c6ebb271b7a31c121d9ac11e0563dda
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://baarspo.ru/strik?utm_term=engineering+probability+and+statistics+problems+and+solutions PDF link annotation
    • https://vawovuwowoxug.weebly.com/uploads/1/3/4/0/134040368/busunafemafok.pdfIn PDF document text
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/dc043cd9461.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/be267.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/jhEBZgj/tic_tac_toe_using_2d_array_c.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/sixaguxazadewo_witilanizisemo_pisewe_sagobajiruzasi.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/62027456356.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/gfghbha/easy_moist_chocolate_cake_recipe_without_eggs.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/cOYVqA1/driving_zone_japan_mod_apk_android_club.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/90jghdI/gangstar_vegas_world_of_crime_apk_download_uptodown.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/lepodunigabesolatoditet.pdfIn PDF document text
    • http://gutibefatidag.medianewsonline.com/papejagajalijiput.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/hBiiWv2/75351284112.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/Cjicjhp/herpes_simplex_1.pdfIn PDF document text
    • https://cdn.sqhk.co/naxenunovus/BekHdje/zewikojejotirilituxugagoz.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/dd53bec53db.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/ghxHqJ8/lakerabavomararitofup.pdfIn PDF document text
    • https://xisofufewazexi.weebly.com/uploads/1/3/0/7/130776718/mesaladoziriweb_bedavukimar_sivif_xalipufob.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/sexew-gepogifu.pdfIn PDF document text
    • https://zanudega.weebly.com/uploads/1/3/1/1/131164011/bolanoneki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_5f11b2a85539413cbb43481f458635be.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_b917de0eed5e4582a9f965e68b17ce15.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_c22497c69dab436793fff1ec7124dea0.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_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 5592 bytes
SHA-256: a8aaa9152f53e27f2fbfb0d6c67ddd6882b83dabcffe7d7d40a9569fffe8472d
font_01_sfnt_off00010cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAC 10892 bytes
SHA-256: 175d918c8c0615de277e031311c96c447eb70a6f5436d95e437ba9f5084907d0