Malicious PDF — malware analysis report

Static analysis result for SHA-256 4021172aace2edf4…

MALICIOUS

PDF

79.1 KB Created: 2021-03-31 13:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc4294237eba6198d36222cb2c55a6e3 SHA-1: 5fd83d86191ca377a441c39b4defcead61717a80 SHA-256: 4021172aace2edf4495ed0259f2d80c13378110dd83d499063001b6c4779e61f
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, and is flagged by ML classifiers and ClamAV as malicious. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure points to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/wix?keyword=fedex+employee+handbook+2019
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/mekado.pdf
    • https://cdn-cms.f-static.net/uploads/4451356/normal_604420f9e7ee1.pdf
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5fd6152c97a78.pdf
    • https://cdn-cms.f-static.net/uploads/4393197/normal_603bce978b10d.pdf
    • https://cdn-cms.f-static.net/uploads/4412896/normal_601a625fae0ab.pdf
    • https://pujowuvorokom.weebly.com/uploads/1/3/5/3/135347933/dapekukod.pdf
    • https://nobozemesatib.weebly.com/uploads/1/3/0/8/130874372/826432.pdf
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6026c9952d659.pdf
    • https://static.s123-cdn-static.com/uploads/4456379/normal_5fc9449043eb0.pdf
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fc7c58734ce4.pdf
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/cc70f20b0.pdf
    • https://bovopoboj.weebly.com/uploads/1/3/0/7/130776351/9650015.pdf
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/werupamiwapikofekili.pdf
    • https://cdn-cms.f-static.net/uploads/4379603/normal_6060974714c76.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_f0459a523dd242a98058413a66b80f97.pdf?index=true
    • https://s3.amazonaws.com/fakuguvil/kisufezubanerojetonegos.pdf
    • https://87deab66-c645-46c6-955a-dbc2758d34a6.filesusr.com/ugd/302fc9_261571da843645b8a4d59d0b6928880c.pdf?index=true
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_ec88faad473c4675a1dac3fbb89a30b2.pdf?index=true
    • https://s3.amazonaws.com/jefazaxal/bajrangbali_ka_wallpaper_ing.pdf
    • https://s3.amazonaws.com/sirilagewuga/age_related_macular_degeneration.pdf
    • https://s3.amazonaws.com/neviwove/83034363129.pdf
    • https://s3.amazonaws.com/zifozujiwi/11681671848.pdf
    • https://ff8eac81-0dee-4da4-b7c1-1dee070544a7.filesusr.com/ugd/2637cf_fbb9f2bce78440ffa2a80eddf5b7837d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d0.bin
709caab45357f7ce92ff2992f4f5aea873bc48a8090525d6c0d8c49c7cfe8b7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 5736 bytes
font_01_sfnt_off0001073b.bin
ed56751d0e8f24bc426a868330324c5510b49ffd5d79fdfb728ca0ec9b386c00
pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 11656 bytes