Malicious PDF — malware analysis report

Static analysis result for SHA-256 43954b82bc66ae57…

MALICIOUS

PDF

86.1 KB Created: 2021-04-04 11:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 524d704bbdd572c47a42cf87b70a5cc0 SHA-1: 5f9aead48fd275f5f21ba048440fd4c5a5f660d9 SHA-256: 43954b82bc66ae571987276a264ba2cbe1035b320a8fcff716e9956b4a63d6d9
186 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. 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 0.9955

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://jottigo.ru/strik?utm_term=what+does+an+absorbance+spectrum+tell+you PDF link annotation
    • https://romigugegis.weebly.com/uploads/1/3/1/3/131384185/fopukelepiranabivi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372080/normal_5fe2cc2193c96.pdfIn PDF document text
    • https://xutevuper.weebly.com/uploads/1/3/0/9/130969179/tebim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fe913e0404c6.pdfIn PDF document text
    • https://nofitipofawotuj.weebly.com/uploads/1/3/4/0/134012335/fe5ebc05e9f0a.pdfIn PDF document text
    • https://rifuvosibimav.weebly.com/uploads/1/3/5/3/135383082/c0caf844aaa8ad.pdfIn PDF document text
    • https://mexejafulid.weebly.com/uploads/1/3/4/8/134880369/5631780.pdfIn PDF document text
    • https://tafajasezo.weebly.com/uploads/1/3/4/3/134312542/zezogajo.pdfIn PDF document text
    • https://gudugobaxav.weebly.com/uploads/1/3/4/5/134500737/a9f8f9f25abce38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485161/normal_6066043b7a63d.pdfIn PDF document text
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/5597041.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/que_es_la_educacion_virtual_segun_autores.pdfIn PDF document text
    • https://vufujisuwe.weebly.com/uploads/1/3/1/4/131437295/7541946.pdfIn PDF document text
    • https://rizofuruw.weebly.com/uploads/1/3/0/8/130873790/5533034.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/a1c85.pdfIn PDF document text
    • https://bogagabav.weebly.com/uploads/1/3/5/3/135305267/pexupisix-komigubofu-mupij-sarokapada.pdfIn PDF document text
    • https://xasigorokukexef.weebly.com/uploads/1/3/4/8/134891024/xitotedulaja_vizal_zemomojeporu_tajiru.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/6769155.pdfIn PDF document text
    • http://kusukeluwabe.mywebcommunity.org/70166740573.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/vuxusugesimo_mivej_wapipe_vuzamowero.pdfIn PDF document text
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/3734385.pdfIn PDF document text
    • https://muzaromiv.weebly.com/uploads/1/3/4/3/134380281/5325270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_605d8b3c466a6.pdfIn PDF document text
    • https://limavewudadeku.weebly.com/uploads/1/3/5/3/135323498/dipobowene.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
    • http://sefowolo.atwebpages.com/asterix_gladiator.pdfIn PDF document text
    • http://jewofeket.onlinewebshop.net/balanceamento_de_equaes_quimicas_por_tentativa.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_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 5400 bytes
SHA-256: 60032356fa457ae6729114d159bc56075fab7f1d50ef3622646f411ca49ea061
font_01_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 12508 bytes
SHA-256: 831e8aa76a2bff8c57ae59952f50dfa0d453da1608ef035621c8a6cb412642b3
font_02_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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