Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37ae234035a2a44…

MALICIOUS

PDF

78.3 KB Created: 2021-06-10 03:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 772a42bb3b93da5b12c0e25b4e08d82e SHA-1: b6ddc19c76333d9afe21e2c7fc73c61f2cf3be60 SHA-256: d37ae234035a2a4454c15bcce7fca0d3f624c5f747f5e519dabe878c2d460518
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URIs pointing to various websites, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/pbw?utm_term=calcul+section+cable+triphas%25C3%25A9+400v PDF link annotation
    • https://nozipukox.weebly.com/uploads/1/3/6/0/136057246/jakonof-wuselexulop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_604ac8368a653.pdfIn PDF document text
    • https://sunowakodi.weebly.com/uploads/1/3/2/8/132814938/1f9e97ab6364df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_603f724433a4c.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/pekigimina.pdfIn PDF document text
    • https://namerodedisa.weebly.com/uploads/1/3/4/7/134771167/7c13e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_60695ae48317d.pdfIn PDF document text
    • https://jezelide.weebly.com/uploads/1/3/0/8/130874318/pusajul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_6063ba5342920.pdfIn PDF document text
    • https://xumolatakikekum.weebly.com/uploads/1/3/4/3/134335049/ranav.pdfIn PDF document text
    • https://vudexugir.weebly.com/uploads/1/3/2/7/132710723/mobasov-totutemurag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389370/normal_5fe51b7cca4ca.pdfIn PDF document text
    • https://xazebuwojij.weebly.com/uploads/1/3/4/4/134467588/rugativ.pdfIn PDF document text
    • https://jerepukiw.weebly.com/uploads/1/3/2/6/132681878/8155678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477173/normal_605d14f6de08a.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://juvupumanut.pbworks.com/w/file/fetch/144510351/what_are_the_3_components_of_deterrence_theory.pdfIn PDF document text
    • http://gaguseka.pbworks.com/f/16273966517.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/11617009682.pdfIn PDF document text
    • http://funesut.pbworks.com/f/nursing_dosage_calculation_practice_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d98b8ce-5982-4370-b6aa-2c2ab176ad82/defelefedesuselexibifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e7b82c-184a-4b3f-b038-e4738dfa71ab/zuremago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afb8bba-9a48-4af5-888e-0769157841d0/swbts_manual_of_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd494ee5-0335-440d-a71a-e939e122b0b4/fudedavitijexixipivopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a834c18-a45c-4f2a-9089-2963df51f1c9/77191836569.pdfIn 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_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 5496 bytes
SHA-256: c23e977a1ef914fa2248ebf7365412c1e8986ab36eab11f11c79c0a779667b2e
font_01_sfnt_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 12256 bytes
SHA-256: 4db9141fddfd5c83c4334706488553128e8c9a35cb698de9485a26ea6deee8da
font_02_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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