Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e39b892e01b81b1…

MALICIOUS

PDF

81.3 KB Created: 2021-02-26 14:38:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 673ba4e0f70da1b7b83322a1b181c016 SHA-1: d8a55bc5fa767a5069101f812198c8ac615a8b77 SHA-256: 6e39b892e01b81b12a0f1c949afcbd469dae462979b2a79d982b1e39c4de2914
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one particularly suspicious URL pointing to a domain known for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://gimoguvi.ru/wix?keyword=stealth+guided+craniotomy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483867/normal_602ae8bd72cb2.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/qjb0kCE/zixemonomu.pdfIn PDF document text
    • http://pasetbs.xyz/tijolizasiradunobukopfcrpx.pdfIn PDF document text
    • http://trysalon.xyz/coordinate_covalent_bond_worksheet49an3.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/bpXtThe/xinefudumoxe.pdfIn PDF document text
    • http://watogoda.mypressonline.com/zogowenuzabufas.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/cx2Djju/38756022054.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/BkJmhgt/78069932314.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/labibizalomimarufamupuxaj.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
    • https://s3.amazonaws.com/fizaxo/algebra_1_book_glencoe_mcgraw_hill.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/34387197465.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/fuvaliguwojofewixijofil.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/niwazefeborepifive.pdfIn PDF document text
    • http://duvodix.myartsonline.com/38269704491.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_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 5264 bytes
SHA-256: 1365557e832559bd7825be300918cc12312952bab0324745ddbaca3457e8959a
font_01_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 10280 bytes
SHA-256: 972419bf19af71321c9326e56ab3e3c1596f53618c5a8c003be3b23c820cc4ba
font_02_sfnt_off00012a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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