Malicious PDF — malware analysis report

Static analysis result for SHA-256 9763ff92b73a554b…

MALICIOUS

PDF

75.4 KB Created: 2021-03-16 10:24:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f868d3b5e322663444154b291c707f5f SHA-1: 25ebc035849c45399949c9f8becb63e43c205023 SHA-256: 9763ff92b73a554b6832d72b43e12f6eb754df0215b5d143089b355fb3190f73
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of URLs like 'https://zajinet.ru/123?utm_term=alight+motion+pro+apk+indir' indicates a potential lure for users searching for specific software, which is then redirected to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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/123?utm_term=alight+motion+pro+apk+indir PDF link annotation
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/2902187.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/18d6899a10cf.pdfIn PDF document text
    • https://logazimakopaw.weebly.com/uploads/1/3/4/3/134399250/9385714.pdfIn PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/xofegopamugox.pdfIn PDF document text
    • https://pugulewex.weebly.com/uploads/1/3/1/4/131406013/regavuxekula.pdfIn PDF document text
    • https://rarejitidod.weebly.com/uploads/1/3/5/9/135993923/09cc56c1a1875b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_604c9bcd0676a.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/notolopimarel-pilobumo-fuvega-palipidupo.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/dufuwabipufuruwafoma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485703/normal_5ffbb213c0e04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479710/normal_5ff5c8b2a2b13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476782/normal_601b97c9dba09.pdfIn PDF document text
    • https://lufosafol.weebly.com/uploads/1/3/0/7/130775677/jixewijufozutez-xoravibokesimax.pdfIn PDF document text
    • https://xugojegisonixen.weebly.com/uploads/1/3/4/6/134684264/2141077.pdfIn PDF document text
    • https://refaxoke.weebly.com/uploads/1/3/4/6/134602084/xukojirijife-weborepaku-fozisilizuza.pdfIn PDF document text
    • https://gidixelasulam.weebly.com/uploads/1/3/0/7/130739099/tukegagujeluzimogapa.pdfIn PDF document text
    • https://juwaxevepatasi.weebly.com/uploads/1/3/0/8/130874094/9516470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_a991225598714dfab4bc51d6424642ab.pdf?index=trueIn PDF document text
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_a0a49d4a5c0143c7a2ca663fe44fc9b1.pdf?index=trueIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_6f7a6bae03c64fb0b0f7cb4272adf467.pdf?index=trueIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_642058a05cee4fb98b233ba0c823da91.pdf?index=trueIn PDF document text
    • https://2567871d-a361-4bfb-a3f1-d78ea70622e6.filesusr.com/ugd/610d21_595f9e00cd33453381760828f82fd048.pdf?index=trueIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_1c24fb80d2ac4d8480945a4ae684bd8f.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_ddeb88f9c76949cea406217ae0b514ff.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_085acf6b37064f7abad081e6a59c792a.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_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 5248 bytes
SHA-256: c51f10cb483e0b124164706e6c11bd61b4bbc8dcc1574b07ebfda615b7aae9cd
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 11116 bytes
SHA-256: 5342277369ff8f1ec2557358f09f146b97d8683a9eddd215ddf10d3f98f59051

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