Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac44ff9af9881a3…

MALICIOUS

PDF

81.8 KB Created: 2021-06-03 16:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 65be9dbb1e56eb01c4e080d6ead384a4 SHA-1: efb5b335b80f44c250b94b1de55f03fa270bdb97 SHA-256: 0ac44ff9af9881a3805629b10446ca3eed5e17765e6b56754c588cba4bc9e4b4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/123?utm_term=fgv+holdings+berhad+annual+report+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367668/normal_605db11de45ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416331/normal_5fc75663292e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_6069cfc4a39d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_605844a9acf73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420441/normal_5fc79fb49bcf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417040/normal_6058b020a29d2.pdfIn PDF document text
    • https://diwejixa.weebly.com/uploads/1/3/4/6/134629966/404459.pdfIn PDF document text
    • https://delezebewokumod.weebly.com/uploads/1/3/0/7/130776218/jiwivaruzozi_bopidudulus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5fd37bab81874.pdfIn PDF document text
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/podavuv_lewoge_xiraga_fowenudad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380695/normal_6009332e34a98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482399/normal_605c3d3eb382b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fd64506746d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_600e5461eab3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392869/normal_606d9452768f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483070/normal_5fd8738ebcff8.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/tajamisukami_lipusukaderud.pdfIn PDF document text
    • https://funexidep.weebly.com/uploads/1/3/7/5/137520049/govepixif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_603fb7bea8c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_602c27233cf11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_600fc7208a46d.pdfIn PDF document text
    • https://bulurumuz.weebly.com/uploads/1/3/1/1/131163623/vopafakova.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410190/normal_5ffc9fc716e3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481847/normal_6045c1263adbe.pdfIn PDF document text
    • https://fofijibub.weebly.com/uploads/1/3/3/9/133999799/fumip.pdfIn PDF document text
    • https://kovunigok.weebly.com/uploads/1/3/5/3/135317038/notum-wefuk-melekotufotox-delem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385852/normal_600c8a04040b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 5776 bytes
SHA-256: 15c01165799c0dc06f9e342c493ccb91503ef641c30d2eaf4ddc8ec656712437
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 11592 bytes
SHA-256: 600b723f459a41440a32f4e7a66a99245d79553e60c82c755ff318d6a3a11d96
font_02_sfnt_off00012b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B45 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378