Malicious PDF — malware analysis report

Static analysis result for SHA-256 52795b0678a6334d…

MALICIOUS

PDF

103.0 KB Created: 2021-03-24 06:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7069f8f5302cf8400f433c3e4edf192e SHA-1: 949dc6ffab3f4a8f2785a8d9334a19b969e57833 SHA-256: 52795b0678a6334d005aa110e9f9f20fa415909ef6c78e5fd60640f10a69b4e8
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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=the+great+gatsby+ch+7+questions PDF link annotation
    • https://cdn.sqhk.co/sulugedako/ii8Gzgj/91239048913.pdfIn PDF document text
    • http://rafonuza.22web.org/microbial_ecology_barton.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/80dbb9.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/iiWjave/rusojijigimuruzemewatu.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/cia03MV/mewefofemojagid.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/QnCiegB/76692413098.pdfIn PDF document text
    • http://kekukuxowan.22web.org/valagijarazero.pdfIn PDF document text
    • https://vuverararusug.weebly.com/uploads/1/3/4/8/134883490/subivamulejejamavo.pdfIn PDF document text
    • https://jawogebewo.weebly.com/uploads/1/3/4/3/134369376/6411a4f29ec7f4.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/dapoxadikidutajojuno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_c7fc5a117342449685f7007c4243f775.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suximawo/ap_name_whatsapp_status.pdfIn PDF document text
    • https://4a1fbaa0-0e67-401b-a466-96699e2e5642.filesusr.com/ugd/9647bf_b6134f2c42f34547bb76acaff0a9c220.pdf?index=trueIn PDF document text
    • http://jataluwapimose.rf.gd/37089816367.pdfIn PDF document text
    • http://dofumuligo.rf.gd/aasld_guidelines_acute_hepatitis_b.pdfIn PDF document text
    • http://lojifasipok.rf.gd/24820502217.pdfIn PDF document text
    • http://baduwujik.rf.gd/17807259824.pdfIn PDF document text
    • http://zulonojaminipe.rf.gd/76148906487.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_520cb612b9f84107bc95c779fbe38c57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/80063838647.pdfIn PDF document text
    • http://fikedexe.rf.gd/11897209472.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/gabugalewagisonedajixigub.pdfIn PDF document text
    • http://fikamax.epizy.com/50629294320.pdfIn PDF document text
    • http://xenemusexo.epizy.com/kudirodivitapetu.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_off0001572e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1572E 5428 bytes
SHA-256: ee3fc94e4d530781be42bd3289f05942efef069c40859118142b1fff6fc8f99b
font_01_sfnt_off000169ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169AD 10976 bytes
SHA-256: 9c50e98e9f9007183995af189cbecf44576e914f229ea3629bf5e020ddc28a16

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