Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cac208c847e3ca3…

MALICIOUS

PDF

95.4 KB Created: 2021-03-09 10:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e542cf57331f7860927c4abb4c324937 SHA-1: d534f98c7cd8b0601d42a0bf42329d5a74034772 SHA-256: 0cac208c847e3ca3efa55562976f22c334ef2c8bdd202f18aa56af1e5dcf4c9b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('dafemum.ru') that appears to be part of a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent. No scripts were extracted, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://dafemum.ru/strik?utm_term=the+complete+works+of+swami+vivekananda+%25289+vols+set%2529 PDF link annotation
    • http://lowufadit.scienceontheweb.net/what_is_the_smoothest_fountain_pen.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/barbri_mpre_questions.pdfIn PDF document text
    • http://ontrade.top/xiforijid4r0kn.pdfIn PDF document text
    • http://wrinklestiltskin.com/xawidumofupumaxetulaljm9w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5fd86827c171e.pdfIn PDF document text
    • http://amorexpo.com/87983941737tzkv4.pdfIn PDF document text
    • http://kuwawaf.mypressonline.com/pune_city_road_map.pdfIn PDF document text
    • http://spain50off.info/download_movie_maker_win_10_full_crackyawm8.pdfIn PDF document text
    • http://alex-chekalev.com/vegatawepuboxuwomujizawqupgo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491705/normal_5fef68da6fddc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_5fd630e40258e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376602/normal_60067b24a49df.pdfIn PDF document text
    • http://classkaod.ru/calculadora_de_demostrar_identidades_trigonometricasinhrf.pdfIn PDF document text
    • http://lalikexitaxixix.getenjoyment.net/divx_converter_10.8.7_serial_number.pdfIn PDF document text
    • http://twoup-viktoria.online/79992824494ayjjy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489599/normal_60446c05acd05.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/sajatofubote/43104479422.pdfIn PDF document text
    • http://bexovivuvere.myartsonline.com/49492711318.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_d57b084768ab4b948242bfa5c152647f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesotat/resoniwekarejivuraxad.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/87086042201.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_b88ea6b8a067488ba785630b64e2337c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/19210023684.pdfIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_7931d553baa349f794e101a229be56d0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001388c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388C 5872 bytes
SHA-256: fba9b5ed4564258b65beb7ae6d00c15ee476c32ff0f939f2f3d6b46d82238e48
font_01_sfnt_off00014c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C81 10448 bytes
SHA-256: 098cae12d5e9bc087e22b15257b74b2bb8652681dad351581122c9bd39e90aff

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