Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70bb6d125b1201f…

MALICIOUS

PDF

103.4 KB Created: 2021-03-28 23:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3dd522887b6072d4b2138e5724c4535e SHA-1: 710515b635ca02537fdc66dd9a40885e1759a007 SHA-256: a70bb6d125b1201ffee4c2e754b62a91fee4d1c860a347bb27a83bc6f5a0b8c5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=disneyland+california+adventure+park+map+2019 PDF link annotation
    • https://cdn.sqhk.co/pixafosabow/d2Jigja/jitakagifojisazelawe.pdfIn PDF document text
    • https://gavofazipog.weebly.com/uploads/1/3/3/9/133999173/5558992.pdfIn PDF document text
    • http://astropsychology.website/crawfish_etouffee_nutrition_informationcbi0q.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/vufusu.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/hKam57X/jageboriwoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/3gjchhT/99711883123.pdfIn PDF document text
    • http://titanovyi-filtr.ru/marjane_satrapi_persepolis_the_story_of_a_childhoodt6e0z.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/gcrijTK/womomovovubitoju.pdfIn PDF document text
    • https://tazidafojunuxu.weebly.com/uploads/1/3/3/9/133997245/dc977409.pdfIn PDF document text
    • http://naturfresh.fun/gemigakodiwigoddo0mv.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/06319c20f7521.pdfIn PDF document text
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/41abc5f0751.pdfIn PDF document text
    • http://micrometerdigital.xyz/dabisorinoruparatuduahlp2.pdfIn PDF document text
    • https://cdn.sqhk.co/sururezog/1sgijah/98270382000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_5262c515916641feadcac31fb844acc7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/minecraft_bedrock_server_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/kawasogib.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_e9d7de899a7f4e9fa7c7cb674fdae57e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1add7a2-39ae-4cfb-a377-cfb93254a550/zokijoweziredibataruwe.pdfIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_a68132d487124165bdc79d39948f154f.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_20c2a5550153481093f79f9e27cf54ff.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_c09704b838c54f7594bf86943f88be17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae051b37-fcfe-4f00-9f1a-2a43b310e718/how_to_eat_fried_worms_google_drive_mp4.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_off000150b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B1 6008 bytes
SHA-256: 8eb1134fbe6ffbafa0993025db842e6170d51c24e3c71fdf6eb016582bee8f47
font_01_sfnt_off0001652a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1652A 12468 bytes
SHA-256: 32a9d18d8555aa87db552f9c7dc78907b159bbd84c12f343990334dbae608884