Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af35d81a4e89077…

MALICIOUS

PDF

97.9 KB Created: 2021-04-08 02:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 056285fe2cf57569869334b6cdd7f95f SHA-1: 47519ea72cfbc0875d0cb865911fa0fdc6458f2c SHA-256: 8af35d81a4e89077abd9d33c2ec0a67e382a74fd25d5f4f2f1fd4f497300ede2
126 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that redirects to a suspicious domain, likely for phishing or malware distribution. The document's content, presented as an 'answer key', is a common lure for such attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/wix?keyword=examen+del+capitulo+4a+answer+key PDF link annotation
    • https://cdn.sqhk.co/wefonasifaza/foQYC0B/mysql_server_default_port_number.pdfIn PDF document text
    • https://pemowazazafal.weebly.com/uploads/1/3/5/3/135385959/21e21bc2a94d5.pdfIn PDF document text
    • https://bowalizixoled.weebly.com/uploads/1/3/1/8/131872289/5425770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_6012763a66b39.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/vhagdhh/93124132590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_603a15595e26e.pdfIn PDF document text
    • https://cdn.sqhk.co/nebinefis/b5Agebc/baby_gap_online_shopping_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/nDtjegh/shipping_manager_jobs_in_singapore.pdfIn PDF document text
    • https://visumosibe.weebly.com/uploads/1/3/0/8/130814065/getugolifo.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/jiiDFgk/vertigo_cure_treatment.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/dUTYhjK/two_points_that_are_noncollinear.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496381/normal_6041624c0fcc2.pdfIn PDF document text
    • https://soxokememomoj.weebly.com/uploads/1/3/1/4/131438280/8e0b2816dce7e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_0f13372f663e41d091887697ea797bd7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/audit_express_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/whatsapp_latest_version_for_android_phone.pdfIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_e34985fc6c824f91bf2cd6fd94761201.pdf?index=trueIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_49e882a3b72e48d8bcc7e69fd8352c52.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_off0001409a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409A 5588 bytes
SHA-256: b827f16b8bd54164da5173be1b5169deb2b2a0b67c650003388b1723a0439310
font_01_sfnt_off000153b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B7 11732 bytes
SHA-256: 3c1bcf2fe97cb145bb5e5afbf101acc0da0bb81bddfb720fbe5a31474bc99b26

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