Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6140efabb11e469…

MALICIOUS

PDF

85.6 KB Created: 2021-04-07 03:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 432c90271e68a1d454bf384181edd110 SHA-1: d0c496214764db13850ca03d4f445c5bfc67baaa SHA-256: a6140efabb11e4692fec7a941073299bccbc0cbca73d6e52501069149cf36789
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 hosting, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=charlie+and+the+chocolate+factory+story+in+hindi
    • https://cdn.sqhk.co/jirowolad/gffricH/agar._io_hacked_gameplay.pdf
    • https://cdn-cms.f-static.net/uploads/4378830/normal_60305aff38ded.pdf
    • https://fiwozipuwawew.weebly.com/uploads/1/3/0/8/130814157/9820517.pdf
    • https://cdn.sqhk.co/sozasusu/cIhckji/sms_brandname_la_gi.pdf
    • https://bedasalisavif.weebly.com/uploads/1/3/4/6/134601990/eb419c5bdc747cb.pdf
    • https://cdn.sqhk.co/dojopaxitovi/bjcshfO/fishing_online_reviews.pdf
    • https://fuwelobuzade.weebly.com/uploads/1/3/4/6/134649994/vuzifibuj-jusofovesiju.pdf
    • https://jupisururixed.weebly.com/uploads/1/3/4/3/134339091/1606871.pdf
    • https://bibevugu.weebly.com/uploads/1/3/1/4/131406802/5689801.pdf
    • https://cdn.sqhk.co/tuxonewebuke/fOgib65/fufarujugedetu.pdf
    • https://static.s123-cdn-static.com/uploads/4417805/normal_600558e84660c.pdf
    • https://cdn.sqhk.co/kopilixa/BwtihfL/modern_tiny_house_builder_texas.pdf
    • https://static.s123-cdn-static.com/uploads/4476751/normal_600549eba7a0e.pdf
    • https://natadafupekex.weebly.com/uploads/1/3/1/8/131856288/b8f0436a.pdf
    • https://cdn-cms.f-static.net/uploads/4446789/normal_6016478aa2ea4.pdf
    • https://bodonovovo.weebly.com/uploads/1/3/1/6/131607174/fbf84c11a0.pdf
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/pepewasivepiwep.pdf
    • https://pesosetolumejaw.weebly.com/uploads/1/3/6/0/136094132/e8f87c3dd8a68f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/de7016f6-8cd2-4d9c-9302-0f96285de286/6874717629.pdf
    • https://s3.amazonaws.com/ganubatebedoxez/how_to_connect_beats_solo_wireless_to_mac.pdf
    • https://s3.amazonaws.com/genedonapubefe/uk_voter_registration_campaign.pdf
    • https://s3.amazonaws.com/zamuriza/pugaduxi.pdf
    • https://uploads.strikinglycdn.com/files/3de14a3c-aa95-4b3b-93a9-04c6aedbcc1f/31853457214.pdf
    • https://s3.amazonaws.com/lanubili/90254915164.pdf
    • https://uploads.strikinglycdn.com/files/cc1668a5-dbbc-4fd5-81de-71574e6aa660/frigidaire_gallery_refrigerator_ice_maker_manual.pdf
    • https://uploads.strikinglycdn.com/files/ec983435-c452-4daa-a14a-017f49000cc2/.pdf
    • https://uploads.strikinglycdn.com/files/997110a9-0ab2-4a9b-9ae8-7ed20581a5ea/book_of_lies_teri_terry_deutsch.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001137b.bin
6d6ae22177793f81fc391854a245f5d52e683612252d7118564dc78eacca455b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 5116 bytes
font_01_sfnt_off000124e3.bin
5921d557eaf0126fc25be4deb4583965b54140eb8b882a352f1a5a203e791fde
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E3 10348 bytes