Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5e1af543d21508…

MALICIOUS

PDF

90.5 KB Created: 2021-05-06 22:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 53fc0b59bd721918c7aa12640fb64ceb SHA-1: d725bd4709388ad4954548cd3f524a3c7c825b56 SHA-256: 9a5e1af543d215085ec759caf674ffcfa7a64eec20aff2c68356574c82cfa52b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'seumenha.ru', suggesting it's part of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a common tactic for distributing malware or conducting phishing. No scripts were extracted, but the presence of external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=how+to+get+rid+of+moisture+in+charging+port+s9 PDF link annotation
    • http://nukotim.iblogger.org/37786216676.pdfIn PDF document text
    • http://tryraisins.pro/vomopezugobibavemokuk2yss.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuzopat/fa5yKif/assassin_necromancer_build_skyrim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421354/normal_5fe5c491cde16.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibapufe/KghcjjF/32108059965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_6019a7cfba3ef.pdfIn PDF document text
    • http://meblik.su/816391505480sgre.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwojosop/jd05D17/gst_ka_full_form_video.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/FeiaXhf/mogegipajor.pdfIn PDF document text
    • http://rarurude.22web.org/luwavufugawixebuserazuj.pdfIn PDF document text
    • http://e-devletodeme.net/12155814870t6a55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_5fe9cd8f076c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_604d161d93e9e.pdfIn PDF document text
    • https://cdn.sqhk.co/bomikiwolug/Nhchehb/jizopozeti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480893/normal_5fcbac3d480ea.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/HjjIieP/nisojozunu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/92110710934.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/61457977484.pdfIn PDF document text
    • http://tesuzegijibonu.epizy.com/d_d_5e_warlock_spells_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/what_is_the_perfect_law_of_liberty_in_the_bible.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 5748 bytes
SHA-256: 4779f623a5e0b77752cfd88af374eda765332bc5c472260a9671e8d0eb9b87da
font_01_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 11312 bytes
SHA-256: aaacfa81877b679041075d05854b6505474d9a7a9624227777d252c614b479f9
font_02_sfnt_off0001470b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470B 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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