Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7e91b0ddbdae14…

MALICIOUS

PDF

65.4 KB Created: 2021-02-17 05:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3ef2ffa9e5eabf3791b204321f8e356 SHA-1: 17a2c2a27acbe91ada77442b210b8a0cc2c89e2b SHA-256: 5d7e91b0ddbdae149cc9c7ae5bcea96923bd6297395c92ad57840f4e843eaf09
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'mass external PDF link farm'. The primary URL, 'https://leonvi.ru/wix?keyword=gladbrook+reinbeck+football', suggests a keyword-stuffed SEO manipulation attempt. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a potential phishing or malicious redirection vector, aligning with the ClamAV detection of 'Pdf.Phishing.Trojan'.

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://leonvi.ru/wix?keyword=gladbrook+reinbeck+football
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/7977141.pdf
    • https://cdn.sqhk.co/fumamimed/ge8hjao/real_boxing_2_apk_hack.pdf
    • https://static.s123-cdn-static.com/uploads/4495395/normal_5ff71c2d9a795.pdf
    • https://cdn.sqhk.co/rajemaramiw/jc0ibia/steel_weight_calculation_formula.pdf
    • https://cdn.sqhk.co/teforoke/Tjbjjib/fashion_nail_salon_bound_brook_nj.pdf
    • https://static.s123-cdn-static.com/uploads/4414156/normal_5fcaa409c2d50.pdf
    • https://cdn.sqhk.co/koditisalupe/gihbV74/8312437118.pdf
    • https://regutipedazuvi.weebly.com/uploads/1/3/1/0/131071249/ab9834.pdf
    • https://cdn-cms.f-static.net/uploads/4481170/normal_602a182d0ee15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pilazi/current_affairs_2017_capsule.pdf
    • https://s3.amazonaws.com/widiku/wawiwopowisamozajawi.pdf
    • https://s3.amazonaws.com/nazekisigiduz/tulit.pdf
    • https://s3.amazonaws.com/fekazudabo/acrobat_pro_dc_stuck.pdf
    • https://s3.amazonaws.com/zarelusipofox/biogas_kotoran_ternak.pdf
    • https://s3.amazonaws.com/wobuzisibal/basic_components_of_pneumatic_system.pdf
    • https://s3.amazonaws.com/fupanabivote/bupekiduxerasamowodek.pdf
    • https://s3.amazonaws.com/bojafazes/kafumi.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c31d.bin
3f0fadf8f106afec076146e2c7ec18744f8fa2f7615ed9d9af345fae48953277
pdf-font-stream PDF embedded font (sfnt) at offset 0xC31D 5072 bytes
font_01_sfnt_off0000d473.bin
1f698ad0ec7167a1869c263f8e9402d9f51d265c2f1e90152a23e47f262d736a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 10468 bytes