Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f324b652584acaa…

MALICIOUS

PDF

67.9 KB Created: 2021-03-19 13:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5e9ea8ae217d7334a7bee921fc9399aa SHA-1: 7febd0f33dbd7d1fccafc65fb65d810aa8f782df SHA-256: 3f324b652584acaa7ca2f7f1da5db0b353bb7007dc884ae73bd439c2d8ac2f21
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, indicative of a link farm designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a common tactic of using documents to funnel users to compromised or malicious hosting.

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://jottigo.ru/wix?keyword=weapon+game+unblocked PDF link annotation
    • https://cdn.sqhk.co/pafatewodoju/iiwhfmZ/32890169684.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/13527974880.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/how_to_eat_fried_worms_book_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/cieitib/virugodulegitapetositifu.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/gegdyhg/95546038476.pdfIn PDF document text
    • https://cdn.sqhk.co/ritafase/geghggr/18554647371.pdfIn PDF document text
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/nemaju-sovevirevi.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/6vhgqNl/lowe_s_coupons_code.pdfIn PDF document text
    • https://cdn.sqhk.co/pipezifiwip/jgDhagc/38462949071.pdfIn PDF document text
    • https://devomejot.weebly.com/uploads/1/3/4/4/134491467/dinigebi.pdfIn PDF document text
    • http://nulivanofika.mygamesonline.org/71567706301.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/69161178734.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/vatakefojunib/11864406858.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/gevol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c0075a-49a2-4da4-bac1-3704ac772e44/82763032937.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/rutiwegopakotetomilapizar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b517ddee-5163-435d-bde4-e04ab5c7806c/la_amortajada_resumen_personajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c798884a-e46c-4240-acf3-443073d2dbdb/42546188988.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/6431535867.pdfIn PDF document text
    • http://www2.engineering.com/GamesPuzzles/nucleargun.asIn 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_off0000cf05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF05 5336 bytes
SHA-256: a82ac70264d6e4b37f65c52bf8043eaa54cf530f66b17b58ef590031840a2168
font_01_sfnt_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 9780 bytes
SHA-256: d9db048b8089e3cfe9befe998f3e1535661df74aca4cea2975340228a69f4fcf

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