Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4045c36616c48ee…

MALICIOUS

PDF

73.4 KB Created: 2021-06-05 04:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5301869153535370e112889b7434bf53 SHA-1: d80ffc95fd99bb05ec5fadae3e40555fc6e8fd44 SHA-256: d4045c36616c48eecd4540ee12863c2c8183ff9e1b0f9ab457d104ff70307072
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm designed to direct users to potentially harmful websites. The document body, though heavily obfuscated, contains references to 'free download' and technical document titles, which are common lures for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/pbw?utm_term=catia+v5+sham+tickoo+pdf+free+download
    • https://mejotumuv.weebly.com/uploads/1/3/4/6/134636951/sipixiwirinokegofa.pdf
    • https://dikefurilixi.weebly.com/uploads/1/3/4/6/134684794/xunexewejumodetodoxo.pdf
    • https://jizimixu.weebly.com/uploads/1/3/4/0/134095846/ed3ca35353a7.pdf
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/nezowez.pdf
    • https://bumifofo.weebly.com/uploads/1/3/4/5/134598811/jigikenupexadu-rufalirisux-xudamovivos.pdf
    • https://cdn-cms.f-static.net/uploads/4471704/normal_60149d9325fb7.pdf
    • https://cdn-cms.f-static.net/uploads/4484376/normal_603e9652cc461.pdf
    • https://xarudaxukisa.weebly.com/uploads/1/3/4/0/134018653/koriratikaz.pdf
    • https://cdn-cms.f-static.net/uploads/4484995/normal_602a0f5da4fcf.pdf
    • https://pinosapop.weebly.com/uploads/1/3/4/1/134131344/6300917.pdf
    • https://static.s123-cdn-static.com/uploads/4449998/normal_5ff77e5b40834.pdf
    • https://lewugudufe.weebly.com/uploads/1/3/4/6/134668986/mapego.pdf
    • https://cdn-cms.f-static.net/uploads/4481282/normal_605fdb01a54c9.pdf
    • https://cdn-cms.f-static.net/uploads/4449178/normal_60414f7c00b17.pdf
    • https://luralaxigagu.weebly.com/uploads/1/3/4/8/134868525/mebiralu.pdf
    • https://takisulajedeviv.weebly.com/uploads/1/3/7/5/137501155/1502565.pdf
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/4437a0bd9b.pdf
    • https://cdn-cms.f-static.net/uploads/4368975/normal_603e186a40547.pdf
    • https://static.s123-cdn-static.com/uploads/4480898/normal_5fc86158cc8ad.pdf
    • https://cdn-cms.f-static.net/uploads/4417523/normal_5fea192a67b63.pdf
    • https://static.s123-cdn-static.com/uploads/4426059/normal_5fef4e0c14e2a.pdf
    • https://buvonumonub.weebly.com/uploads/1/3/5/3/135304713/ff88c0.pdf
    • https://satutetijin.weebly.com/uploads/1/3/4/6/134635437/murajezafimo.pdf
    • https://vupokidenug.weebly.com/uploads/1/3/4/6/134699393/letelusaxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000df20.bin
a3dba2efb8736a7e0f6a86eb6bc76108c9bbe974eb9438e31709e4d7008e0530
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 5640 bytes
font_01_sfnt_off0000f23f.bin
74c412d948cf2fd8f04908b9b4566ded333be843586c56b45454119b0e77c901
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 11076 bytes