Malicious PDF — malware analysis report

Static analysis result for SHA-256 5061c77e942cb960…

MALICIOUS

PDF

70.0 KB Created: 2021-03-02 22:15:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c3819b1bce47d1a3dc6ddbd4bc536bb3 SHA-1: 4c1ad54dc13869ec1f43ea3341a6639f7d4443f8 SHA-256: 5061c77e942cb96076c274c0790d19a8a5d23716547fe918eab7dad305237be7
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users.

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://leonvi.ru/award?keyword=polaris+trail+boss+250+engine+swap PDF link annotation
    • http://mx50off.pro/is_the_plant_paradox_vegang5dqp.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/sarikefazonumete.pdfIn PDF document text
    • http://bopikifej.22web.org/2460661915.pdfIn PDF document text
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/b489afcf76.pdfIn PDF document text
    • http://reestr.site/biwowaxikavuwosutfq6w3.pdfIn PDF document text
    • https://cdn.sqhk.co/vibesadebo/M3iaig0/sikakezubukuvisowopadibu.pdfIn PDF document text
    • http://zelaxukixut.iblogger.org/52934208571.pdfIn PDF document text
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/sawazilanovuw.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/iXmgji7/sojanemegite.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/tt4iac8/dream_city_metropolis_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/sexasegavon/jJehhBM/yong_heroes_hack_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesidif.epizy.com/windows_10_free_fire_game.pdfIn PDF document text
    • http://koxowasone.epizy.com/holley_carburetor_identification_guide.pdfIn PDF document text
    • http://zilomit.epizy.com/92488637341.pdfIn PDF document text
    • http://suwugiborewetel.rf.gd/38141982375.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_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 5616 bytes
SHA-256: b3c957369a3c4ea4c3385ae9e49ee8a1c5ae381b0fc57332445ab3afb080bf5b
font_01_sfnt_off0000e76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 10472 bytes
SHA-256: cf160a1d13a14d3a84adefe4b1bd00a0bf9d8981f943f74932cb6b6d9ce7efd9

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