Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5b4c94749a3657…

MALICIOUS

PDF

80.4 KB Created: 2021-03-10 16:39:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca87688df72e9c1afe52e4c9d8c9cf9e SHA-1: 1b44a42d9ee5a511ec4ca934ae90bf9f276121bb SHA-256: 6b5b4c94749a3657e99fc7b361acb88015c09e8bfa8ac0a75bfd4a5c70ff0cf8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to manipulate search engine results or direct users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/aws?utm_term=paint+cabinets+with+sprayer+or+roller
    • https://gewujamagig.weebly.com/uploads/1/3/5/3/135339218/nakalikivukus-pagop.pdf
    • https://cdn-cms.f-static.net/uploads/4466676/normal_6033a27d3aa42.pdf
    • https://cdn-cms.f-static.net/uploads/4502493/normal_5fd0bd9ced5eb.pdf
    • http://astropsychology.site/evli_kadn_etkilemenin_yollarvmnsc.pdf
    • https://linugezi.weebly.com/uploads/1/3/4/2/134265501/4771d47e69757.pdf
    • http://legendnat.space/lisa_dent_curatorittg7.pdf
    • http://hotel-engels.ru/reading_comprehension_text_with_questions_and_answersvoz7o.pdf
    • https://buvikibera.weebly.com/uploads/1/3/1/4/131453013/a173527.pdf
    • https://ruloxewetufo.weebly.com/uploads/1/3/1/1/131164393/46af5bf3f4.pdf
    • https://cdn-cms.f-static.net/uploads/4481059/normal_604058f413d81.pdf
    • https://cdn.sqhk.co/jokawefezo/mgcgcKm/mexikavifu.pdf
    • https://cdn-cms.f-static.net/uploads/4422372/normal_60136839babde.pdf
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/61851.pdf
    • https://bivedaniliged.weebly.com/uploads/1/3/4/7/134732971/7683228.pdf
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/zukepinumivu-matigefiv-razuwamirubuxul-fovusekew.pdf
    • http://stnold.com/telecharger_moto_rider_death_racer3zh2z.pdf
    • https://cdn-cms.f-static.net/uploads/4424696/normal_601499b0a7c1d.pdf
    • https://cdn.sqhk.co/dibitarebizu/jxaBqyU/67693703526.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_8d673a2f9ac04a7ab67e20cd8557379c.pdf?index=true
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_87c866c44c224c5b8c6c1ec0282f7ec2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36a.bin
bc3327c0729aec09e7bc23c3b45f96d962403138ac9dc820e4027fb5729f6e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 5356 bytes
font_01_sfnt_off000105a3.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 1800 bytes
font_02_sfnt_off00010e31.bin
6e5f624116ec153d88bbf26f536e844fc7b4b677bf847f808c092819372694a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 11052 bytes

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