Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31ae0c88788c1c2…

MALICIOUS

PDF

74.1 KB Created: 2021-04-29 06:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: df67fb56c1489bc272788deb976879c2 SHA-1: 82062c6ca744170975b54f0c67915a90d5c359f1 SHA-256: c31ae0c88788c1c2d60dec4f4bc7d7455fce880eb634f7f4761820a575b9a61e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The embedded URL `https://xajibur.ru/strik?utm_term=how+long+do+you+cook+a+turkey+in+a+roasting+bag` suggests a lure to a malicious site. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/strik?utm_term=how+long+do+you+cook+a+turkey+in+a+roasting+bag PDF link annotation
    • https://cdn.sqhk.co/jurugaguvedu/i1jii46/benaseti.pdfIn PDF document text
    • https://wemeguxenuvoj.weebly.com/uploads/1/3/3/9/133999449/vuzedup-tetewes.pdfIn PDF document text
    • https://begakidiwadagav.weebly.com/uploads/1/3/1/3/131397934/9c234abbf45b.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/gdesrRt/wepabawavasizavibotuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503987/normal_5fe78fb2b72c6.pdfIn PDF document text
    • https://rivewatot.weebly.com/uploads/1/3/3/9/133999312/mukapuromiroz-zoluru-netog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_605b65dcd4135.pdfIn PDF document text
    • https://cdn.sqhk.co/gasajolop/gg8ifwp/19971421024.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/xoxodixazab.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/25845964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_5fd77e0714e2c.pdfIn PDF document text
    • https://cdn.sqhk.co/duxajoje/RjehiI3/octopus_apple_watch_band.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/ZgfOjbx/panobujolitazubekezezeriz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_602a50ea69251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417309/normal_5fc7a98cb465e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_cd7153945da34ad28bacc258f5e911c9.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_88cce02cee874ecaaa97e388e4881129.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirosisob/pifujugerutifefopawaj.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_7e89457211394286bb75f6740a522e27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kumasala/nowupe.pdfIn PDF document text
    • http://nuloporime.rf.gd/47029883867.pdfIn PDF document text
    • http://pasazaxara.rf.gd/dibujos_de_calaveras_para_colorear.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/introduction_to_anglicanism.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_off0000e499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 5464 bytes
SHA-256: 077bddaa5097ab136f9e4940763b7ccb26871edd6017270e1d2f6a2b1712f9c9
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 10400 bytes
SHA-256: 9516ffb659a7797483f43260a2bd58dc1e15dc84079d6577bc4973b2d3c26e76