Malicious PDF — malware analysis report

Static analysis result for SHA-256 272f88faca5418ad…

MALICIOUS

PDF

78.0 KB Created: 2021-02-13 02:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2dc35db4a8cf6a4e75ffb6c45c56c4fc SHA-1: ddeb8dffe06b84ed1ac81f3f878397f1b50b7b36 SHA-256: 272f88faca5418ad4b56098754a61bd95e358c23916d2aa02be7cb40a8936eff
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=vudu+gift+card+fandango PDF link annotation
    • https://ridakikasidom.weebly.com/uploads/1/3/0/7/130739592/841670a74225fd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402960/normal_5ffb6f87ce4be.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/dokilipitonunusoxag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451561/normal_5ff6672d816a5.pdfIn PDF document text
    • http://tersq.fun/pauls_online_notes_calculussu768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381788/normal_600940221a1bc.pdfIn PDF document text
    • https://dolilugufup.weebly.com/uploads/1/3/0/7/130776220/6207770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_5fe6f5ac9932a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_601d36e6cb7a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_60253ee3921a3.pdfIn PDF document text
    • http://dofitodisibo.22web.org/kosogevawizexid.pdfIn PDF document text
    • http://pubgucbayim.com/music_album_websites_freeqoxth.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/human_anatomy_and_physiology_1_b_pharmacyuwa9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529697/normal_6023ec8a3d415.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/lofape.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/abc7eee8729cd.pdfIn PDF document text
    • https://wekakukuzibeli.weebly.com/uploads/1/3/4/0/134000436/kujelonegepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xiteberukebeki.epizy.com/gmat_questions_and_answers.pdfIn PDF document text
    • http://witigunakejawi.rf.gd/zopimuloveb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 4944 bytes
SHA-256: 117e85a87bdea182c2e6cc82cbd47c4eac25c12fe8bbc05d15410854ab5a0207
font_01_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 10764 bytes
SHA-256: 957c9614dc41b3b5f1e959c3127800de1e39265a34553fd1cd5ab42f27931219

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