Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86a99cf06977518…

MALICIOUS

PDF

73.6 KB Created: 2021-05-23 18:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0ada9e94e574b72a82a66b19d9ab466e SHA-1: 5709d1ab66a4667f2ad06f742144b120164c7854 SHA-256: c86a99cf069775182890113d32a824f30a1f3db5f8833c73967bbf7eda60d2a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were extracted, the structure suggests the PDF is designed to redirect users to a network of other documents, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://jukatuve.weebly.com/uploads/1/3/2/7/132741058/dakuwakigodap_tifizi_ruxisizomajex.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4447631/normal_6004947b4270b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_603509426b2ed.pdfIn PDF document text
    • https://donoreto.weebly.com/uploads/1/3/0/9/130969624/nudelaxefatiwe-torogod-kabesaw.pdfIn PDF document text
    • https://lemapemoj.weebly.com/uploads/1/3/4/0/134040436/mogujivuset_mijugireteso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465390/normal_5ffaa1222d127.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/WboozbXZlIE/wb?keyword=sony%20mex-n4100bt%20wiring%20harness%20diagramPDF link annotation
    • https://s3.amazonaws.com/minabiwa/53996756921.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/voporejitikonoxuliwajixa.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/what_is_the_average_salary_for_software_engineer.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/health_o_meter_weight_tracking_digital_scale_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/36385698124.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/transform_fault_boundary_meaning_in_science.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/spanish_english_translation_list.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/sabefidokudebelowa.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/8774030568.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/population_du_cameroun_en_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/34873525326.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/lucky_patcher_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/glencoe_geometry_chapter_3_practice_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/90629104592.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/4866234189.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/dell_u3011_manual.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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 6024 bytes
SHA-256: 9ff997dff1e2a212d1669dc1dbfd75f827376d17c0337a0f126795445d810f82
font_01_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 10440 bytes
SHA-256: 9c2bbe6a92e3e177b15b15bb4573813671b76ac7f882c810823f3596336ebb74

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