Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bb179e65ae2f2c…

MALICIOUS

PDF

80.4 KB Created: 2021-02-25 00:46:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: dc136469c9f6c19ac95c2ffbdf788b7f SHA-1: 3459786fff68d8698ca940f5465e40048658939e SHA-256: 53bb179e65ae2f2c4dffd31303fff6c4b28d7089a3aff95537125fb89169e928
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a PDF link farm. It contains numerous external URIs, with a primary suspicious URL being https://bologen.ru/strik?utm_term=euro+ace+vs+400i. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to potentially malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://bologen.ru/strik?utm_term=euro+ace+vs+400i PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385434/normal_60356bf81ec67.pdfIn PDF document text
    • http://gunepevoxop.66ghz.com/tolerevojajilemetad.pdfIn PDF document text
    • http://terugate.mypressonline.com/sefejegixodejafadujuj.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/64554158297.pdfIn PDF document text
    • https://femuketidoxesi.weebly.com/uploads/1/3/3/9/133997502/0064243ed4a40d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_601ce48810222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_60102252b3826.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475997/normal_5fff67c0bc824.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/storyboard_pro_free_trial.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/gixirojozogufux/22105636592.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/nawojotaxasemumo.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/paxizenomeka.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/2012_nissan_sentra_sr_service_engine_soon_light.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/ridegegaboketav.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/old_navy_school_uniforms_online.pdfIn PDF document text
    • http://rozipiliwune.epizy.com/wugabitegisowu.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/battery_saver_apkmb.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/nibowilofimokugudadaj.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/17617905672.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_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 4704 bytes
SHA-256: 42d197c27b584209b14309c6ca0222c169de9a33459e1c6d616bc954e2816a3d
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 11724 bytes
SHA-256: 6615d229cab3ef2634a9bf714d2c516492f8ce25f212196851dc9c6684214936
font_02_sfnt_off00012633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12633 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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