Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9ec88f4c8d2ddc…

MALICIOUS

PDF

69.0 KB Created: 2021-03-23 05:30:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b954fef085632c9df0f6ebc8da652752 SHA-1: 109a64ece17e1d41c9bed51877ff3e3a9e3b9213 SHA-256: 9f9ec88f4c8d2ddc9ba428fdd62667c3fdd55f12be480457f78c417864bdcd53
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=which+character+strengths+are+most+important+army PDF link annotation
    • http://soinjaga.ru/lugepaxafojuzagee4qk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_6014d1fb7d420.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/285759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_602c359848df4.pdfIn PDF document text
    • https://piriwunetu.weebly.com/uploads/1/3/1/3/131379541/417585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_5fd15d0bdee43.pdfIn PDF document text
    • http://katermore.ru/how_to_connect_to_wifi_on_dell_xps0puur.pdfIn PDF document text
    • http://astrohelp.space/bibojikopimoda1jq9l.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/jtLiije/9177318662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_6053a7e14e0e6.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/wesapenurajinubusi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494674/normal_5ff90cd9a0112.pdfIn PDF document text
    • https://cdn.sqhk.co/monazaxumol/UXDLVEa/53467496896.pdfIn PDF document text
    • https://jerolota.weebly.com/uploads/1/3/4/8/134859034/fetovaxusor-figojur.pdfIn PDF document text
    • https://zalevetupuxigex.weebly.com/uploads/1/3/0/7/130739655/jizatusisawa.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/w5ijqhe/nezezuteraxexewimor.pdfIn PDF document text
    • http://cabinetsly.xyz/45883414463dwk8s.pdfIn PDF document text
    • https://rusekawavupor.weebly.com/uploads/1/3/4/0/134096427/be7936.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/xubusijazidigo-tepexovaxetat.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/fhj9sjd/pexitakusupixibamirelaja.pdfIn PDF document text
    • http://vladmer.ru/lavamesizenodidajgp28q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_f3c68b008094468db10833e4ae449feb.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_7bc42c30b0ce4be49ad46dfc554629e9.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_4925ca510a01473992045bb474467ec0.pdf?index=trueIn 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_off0000cf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 5428 bytes
SHA-256: 78182ef49d0106eb33087423dcd9231d70d94b7ecd76353aae0a20cc8c560825
font_01_sfnt_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 10744 bytes
SHA-256: ed027c3649dcd385edb36f00454cdc22c9cdda77ab8e933ff8d977719adbea38