Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b423044abd9ce6…

MALICIOUS

PDF

73.6 KB Created: 2021-05-29 19:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7a0a08943c2dc6d406993ae2c723c628 SHA-1: 902e26ee52422a3fe6d5b6ca7412ec1eac2cd1bd SHA-256: 77b423044abd9ce656654dccd16922e871171873536c613842ea4b56972e42d7
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 0.9998

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.
  • 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://maypoin.ru/strik?utm_term=what+is+a+friedel+crafts+acylation+reaction PDF link annotation
    • https://disanelazutiwi.weebly.com/uploads/1/3/4/3/134361230/432538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470542/normal_605c358eca962.pdfIn PDF document text
    • https://pugewolusaw.weebly.com/uploads/1/3/1/4/131453132/taxofujof.pdfIn PDF document text
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/7785478.pdfIn PDF document text
    • https://sovewepipofev.weebly.com/uploads/1/3/4/8/134846449/ludajagojaziz-kajebag.pdfIn PDF document text
    • https://nugekowu.weebly.com/uploads/1/3/4/5/134587082/64efc3.pdfIn PDF document text
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/3916628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_6044fb3dee125.pdfIn PDF document text
    • https://fawofasoz.weebly.com/uploads/1/3/1/4/131454040/6fc695b92bd2e40.pdfIn PDF document text
    • https://fobabugukejapa.weebly.com/uploads/1/3/4/5/134576868/84df63da6.pdfIn PDF document text
    • https://lasunawinifomun.weebly.com/uploads/1/3/4/3/134385524/regaludakedi_kasigifolu_fegawajaxegimoz_bimigegi.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/9d19a9.pdfIn PDF document text
    • https://ninozaji.weebly.com/uploads/1/3/4/6/134690112/739432.pdfIn PDF document text
    • https://watowerapomos.weebly.com/uploads/1/3/0/7/130775357/lasivoveboj.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/xegot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3445de-9fde-4cc2-8a15-ea4a7c359597/xuburoxalora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236b34a5-8821-4e5c-803e-15ea9f0bf319/20325325327.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 5224 bytes
SHA-256: e32c6c211a6d5c86a970adeee4114b6fb53631fe8be3cbe332884bc2eef4eab8
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 10112 bytes
SHA-256: 1afcb9c0d4f75d4ac32a28e4318eaa645ccf4f11fa94cf408868becf00c60f56

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