Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b43232a134beab…

MALICIOUS

PDF

78.1 KB Created: 2021-02-27 22:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 13e72cd3dc73efd6483bc89d08a44157 SHA-1: b2384ebef7b02138604987eea3cd0b111afdcc38 SHA-256: 84b43232a134beab84fdecebe7823a5c86cc22daefbe8148b9d32982706ed300
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL pointing to a 'letter of good standing' lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/wix?keyword=letter+of+good+standing+state+of+oklahoma PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450259/normal_60053888e1122.pdfIn PDF document text
    • https://zonerizarom.weebly.com/uploads/1/3/4/3/134310007/lilupatatezufas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388160/normal_602864064ed90.pdfIn PDF document text
    • https://satewode.weebly.com/uploads/1/3/1/4/131407014/toxirota.pdfIn PDF document text
    • https://sabizedikidoxar.weebly.com/uploads/1/3/2/6/132681903/8936037.pdfIn PDF document text
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/vijopoxojaji.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/bd94285aa4.pdfIn PDF document text
    • https://kibibobufusasi.weebly.com/uploads/1/3/4/6/134643218/bigugidumu_lopoxiv_sulinira_gevozil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_601f6487931a2.pdfIn PDF document text
    • https://laxedojopepab.weebly.com/uploads/1/3/4/8/134896069/rizetawog.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/lipokidadovavi.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/geweboso_penuwe_buvufavu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_5fc8723c7b03f.pdfIn PDF document text
    • https://kolabonedabisam.weebly.com/uploads/1/3/4/3/134398983/womazimim.pdfIn PDF document text
    • https://jarivilil.weebly.com/uploads/1/3/4/0/134012847/junemigobajabavasoj.pdfIn PDF document text
    • https://vuverararusug.weebly.com/uploads/1/3/4/8/134883490/0154d74.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
    • https://s3.amazonaws.com/zuwimadaneb/palizusaparedilolunis.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/aeroperu_603_accident_report.pdfIn PDF document text
    • http://buposubugoromot.rf.gd/beach_buggy_racing_ps4_trophy_guide.pdfIn PDF document text
    • http://totofexux.epizy.com/5218103184.pdfIn PDF document text
    • http://totawuvibewe.rf.gd/singapore_math_workbook_grade_6.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_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 5116 bytes
SHA-256: af40be642d640765473614a6e5021d088844fd3d8431c01243100591d4b5cb6d
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 10356 bytes
SHA-256: a6ab015c57c9b29d2d15019b76dd72837e5861c49ca43cc96d489c8e1b58f168
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378