Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac92f9b7fe42c024…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 17:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c9e9cfae4d6f2e589a553a1a6868b79a SHA-1: 2aed04767f960bdf80a6135744d82bed6dc92fda SHA-256: ac92f9b7fe42c0244f04afd13830eb88598d6c2924f47da092e214d49d9ced40
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic findings point to the document being a link farm hosted on disposable domains, with one external URI leading to 'baarspo.ru'. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content, likely for phishing or scam purposes.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/wix?keyword=michigan+natural+resources+charlevoix+mi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501961/normal_604980e97616c.pdfIn PDF document text
    • https://jowadukezivi.weebly.com/uploads/1/3/1/3/131379295/9603000.pdfIn PDF document text
    • http://emirofficialzm.com/how_to_use_total_gym_accessoriesvzwn1.pdfIn PDF document text
    • http://getsol.xyz/597537550715csmh.pdfIn PDF document text
    • https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/kofilu.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/the_painted_bird_empire_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_60064bd2a27ab.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/boccherini_minuetto.pdfIn PDF document text
    • http://pc-remont.website/bokukojoremale69n71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366389/normal_600955e3a9018.pdfIn PDF document text
    • http://salestore.pro/informatica_powercenter_workflow_administration_guidezrh34.pdfIn PDF document text
    • http://pokypka.xyz/53196517980vopma.pdfIn PDF document text
    • http://tomerezadix.iblogger.org/14490809097.pdfIn PDF document text
    • https://xatodibe.weebly.com/uploads/1/3/5/9/135966399/9c0dff3395cf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_5fd7860ff3f3f.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/2bb0e5c1083b141.pdfIn PDF document text
    • http://wutoxurusot.iblogger.org/notipodoxeripajumalo.pdfIn PDF document text
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/8234128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_60427d5026535.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://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_01a03e6d6b76437c824edee58dbf2bef.pdf?index=trueIn PDF document text
    • http://pojisugafini.epizy.com/axios_post_data_format.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_fd07a98d738245a5b6413c776824224d.pdf?index=trueIn PDF document text
    • http://nodixuzotegiv.rf.gd/amc_8_results_2020_aops.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_47cb99cce3974b508e521b01bf6c69c1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 5228 bytes
SHA-256: 0bd4a4374985a5c3774d4c8722909a96e0dabcc4785931396c6e01861b42ce64
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 11516 bytes
SHA-256: 6f78520b67ec31b747e1c85b9ba7e71d33b41070c0195da2cee6b2c257fbd0d2
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2