Malicious PDF — malware analysis report

Static analysis result for SHA-256 1891fbd60641a236…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 23:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24bf0795ea545882db8db8f600507626 SHA-1: b5a4040b8342bbecac848df55fc4bfbd6b5399e1 SHA-256: 1891fbd60641a2362f7f49935f7051f8964abccd6c52e31d8047924f8f7c641b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains commonly associated with SEO farms or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://pelibifir.ru/strik?utm_term=how+to+factory+reset+dell+inspiron+e1505
    • https://cdn.sqhk.co/kusamika/hcbP4ic/86433228255.pdf
    • https://static.s123-cdn-static.com/uploads/4375344/normal_5fcdfc256ae15.pdf
    • https://cdn.sqhk.co/bilanogakiw/ezuJjd7/90415742849.pdf
    • http://nusorogexirexi.22web.org/96168263820.pdf
    • https://cdn-cms.f-static.net/uploads/4405904/normal_604cfc4455707.pdf
    • https://rezusoroporinon.weebly.com/uploads/1/3/2/6/132695427/xuvuvagimowaz.pdf
    • https://cdn.sqhk.co/fexejikexew/oOibOkn/7128638930.pdf
    • https://cdn-cms.f-static.net/uploads/4411935/normal_6032d74313c81.pdf
    • https://cdn.sqhk.co/waxobakal/jjwbrcF/81403755793.pdf
    • https://cdn.sqhk.co/bufudoraxala/bgctaja/zurolixovapas.pdf
    • https://zuligenewem.weebly.com/uploads/1/3/4/7/134749141/lufeme.pdf
    • https://roxomikanu.weebly.com/uploads/1/3/0/8/130873860/5180877.pdf
    • http://maporirunigis.22web.org/povesetorib.pdf
    • http://rumajasajobotod.iblogger.org/lilokuzizodi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jevelel/92953175446.pdf
    • https://s3.amazonaws.com/dovulavavo/zunojivagutivop.pdf
    • https://s3.amazonaws.com/xurixado/oppo_f5_android_8._0_oreo_update.pdf
    • https://s3.amazonaws.com/dowadotiju/75667674879.pdf
    • https://s3.amazonaws.com/memobofilenabon/how_to_make_my_bluetooth_mouse_discoverable.pdf
    • https://s3.amazonaws.com/nemafu/construction_site_safety_management_plan.pdf
    • https://s3.amazonaws.com/sinamozagemoger/8721903443.pdf
    • http://zakivijojinikij.epizy.com/the_darkness_2016_parents_guide.pdf
    • https://s3.amazonaws.com/rexogeguxosix/xizojif.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_off0000ec1a.bin
de6688f3431d562ea52d0a603a28153651c97f20ed3079b364365139c6cb1100		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 5620 bytes
font_01_sfnt_off0000ff6e.bin
ddf973db27292755c18f1932866951fd490fa9dd333637c0d521485cb439bf0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 10492 bytes

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