Malicious PDF — malware analysis report

Static analysis result for SHA-256 7666ef6b392b232b…

MALICIOUS

PDF

72.2 KB Created: 2021-02-28 10:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05cc66dbe674061263eb76f7c1b4d2ad SHA-1: 11184929e29ca69305ae3fce0db69c6c0a7407a6 SHA-256: 7666ef6b392b232b1ab130cf3213ebfef149e7483b8f0cb4e32f758574423978
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, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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://xajibur.ru/123?utm_term=how+to+tell+if+freezer+isn%2527t+working PDF link annotation
    • https://kovajokuluvemu.weebly.com/uploads/1/3/5/3/135335912/1341640.pdfIn PDF document text
    • https://cdn.sqhk.co/bevurokakug/b0iahee/traffic_rider_hack_ios_apk.pdfIn PDF document text
    • http://cyberghost.store/23758577566l4vt0.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/gKchiJT/rupikixopimoxakulede.pdfIn PDF document text
    • https://cdn.sqhk.co/zibavuna/KRYy0hg/wajibogam.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/6128642.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/ij7Pphj/75849727258.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/bgjeZW4/17890616426.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuwuwiri.rf.gd/java_number_format_decimal_point.pdfIn PDF document text
    • http://rifufogasuser.rf.gd/ligomisoxiwexotu.pdfIn PDF document text
    • http://suzowow.rf.gd/god_will_answer_your_prayers_quotes.pdfIn PDF document text
    • http://medesawawolujim.epizy.com/14704104486.pdfIn PDF document text
    • http://xebinuv.rf.gd/vugulitexatuzivi.pdfIn PDF document text
    • http://lazuvuvopa.epizy.com/17629056992.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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 4924 bytes
SHA-256: a195a5974e66e3cf39939331f561882fa4d3f5edbbb1e11236298c2cf53489a6
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 10628 bytes
SHA-256: 61ca41fb2af83a49368a800db94c995572b53a8b91fa0ed3a53027b7be6d4fdf

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