Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b65019a7f5bdd3…

MALICIOUS

PDF

77.5 KB Created: 2021-03-02 16:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c96bb2e885c3b676aba0dde7f3696907 SHA-1: b590cf44012a5174388e16ca262f676d71e07a3d SHA-256: 19b65019a7f5bdd36555f57f5ca5b8548c3a8a3203ae79ee4d989b0350b2032a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO abuse tactic. The embedded URL 'https://resalured.ru/award?keyword=how+much+does+mcdonald%2527s+pay+new+employees' indicates a lure related to employment, likely to drive traffic to malicious or ad-heavy sites. ClamAV detection and ML classification strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=how+much+does+mcdonald%2527s+pay+new+employees PDF link annotation
    • https://cdn.sqhk.co/retagigimusa/hagiHJk/8951869501.pdfIn PDF document text
    • https://movalolutipala.weebly.com/uploads/1/3/2/6/132681002/kowozo.pdfIn PDF document text
    • http://keep-travel.com/nujuxibonefukufp65z7.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/d1uhjge/93193732330.pdfIn PDF document text
    • https://torudedo.weebly.com/uploads/1/3/4/3/134352944/mabawu.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/37273960415.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/bidinuma.pdfIn PDF document text
    • http://lngcliente.com/vurufapdgd2k.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/murud.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/mumewoteradimala.pdfIn PDF document text
    • http://giftcard-sale.store/appvn_android_apk6u1oj.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/732958.pdfIn PDF document text
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/susoligadop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedisijusa.onlinewebshop.net/which_bare_act_is_best.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/90928748597.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_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 5404 bytes
SHA-256: 8339fbcfe7ec169141a6fa6ba6c513c2d8017a243975ec8bb1aa231a776bfbbb
font_01_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 10704 bytes
SHA-256: 10ea7a3a1d41d870dd182af91bf96faaf814021717c04a835905ca5d09234e1c

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