Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa46b389f4d7801f…

MALICIOUS

PDF

72.8 KB Created: 2021-02-15 23:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1a3095febde17ebd7914eeb461b35ca4 SHA-1: 1b77d9b6547d586b650d2d46a93faa27ceb5d198 SHA-256: fa46b389f4d7801f6f4ffa043ff7447274e9e617758d9ab6d6a1447077337df1
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains or Weebly hosting, suggesting a link farm or phishing attempt. The primary URL, https://baarspo.ru/123, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=does+the+hormone+reset+diet+work PDF link annotation
    • https://zogafopuniv.weebly.com/uploads/1/3/5/3/135390308/xatez.pdfIn PDF document text
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/sogizoxaga.pdfIn PDF document text
    • https://biramufon.weebly.com/uploads/1/3/4/7/134775887/5612182.pdfIn PDF document text
    • http://zoo-taxi.site/exercises_present_simple_negative_pdn0x1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484612/normal_5ff9c3ae1262b.pdfIn PDF document text
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/jobenewopewes-dipol-wokabo-fidesofi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451757/normal_5ff9febbf11ef.pdfIn PDF document text
    • https://kezuvuxir.weebly.com/uploads/1/3/2/8/132814306/gexekemi.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/solo_dance_performance_in_telugu_songs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470839/normal_5ff5a2db79334.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/9146177.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavale/android_auto_apps_not_showing.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/55512887252.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/biology_text_book_for_java.pdfIn PDF document text
    • http://bojonovaja.rf.gd/dependent_and_independent_clauses_exercises.pdfIn PDF document text
    • http://xofafatererowu.rf.gd/carrom_board_pool_mod_apk.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_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 4976 bytes
SHA-256: 9cb3a880779d1f67c433b1656d309e7fc956fd028c3399ae8391bc2481c7ce74
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 10628 bytes
SHA-256: c30a32b87939636bac980d25cb3baaa5e75f689ce051b8d1af7fe11d89ba0030

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