Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f73f7458b8e6c7…

MALICIOUS

PDF

66.4 KB Created: 2020-11-22 21:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ce683e682ee2b2052d04164730400635 SHA-1: 29253d8d9c55ca8d0bb7151d0265596159905030 SHA-256: 54f73f7458b8e6c7a92d5f43d8b88d99ff6408e5c342a2e3d94ae61b9de86d33
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://traffset.ru/123?utm_term=4.2+the+structure+of+an+atom+worksheet+answers PDF link annotation
    • https://vupubajuxik.weebly.com/uploads/1/3/4/4/134492473/rotudajesekexo.pdfIn PDF document text
    • https://doriruvoni.weebly.com/uploads/1/3/4/5/134585963/xomemis_bivukux.pdfIn PDF document text
    • https://diwodineguxep.weebly.com/uploads/1/3/4/3/134305573/remijaxumeleg-samekapix-fewosolab-wemadasesivowu.pdfIn PDF document text
    • https://xibemorebag.weebly.com/uploads/1/3/4/3/134355918/pemed-tapenujufa-fovaso.pdfIn PDF document text
    • https://tevitoretej.weebly.com/uploads/1/3/2/6/132680933/1423626.pdfIn PDF document text
    • https://lolipakefupixo.weebly.com/uploads/1/3/4/6/134614949/lefus_pijaxosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/adfb0b58-13d2-4400-9854-eef02cf340fc/44055603042.pdfIn PDF document text
    • https://s3.amazonaws.com/medadele/14226375361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2393df98-04ec-49e2-b628-c35f9b85b38f/gexaxuzit.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DF 5400 bytes
SHA-256: 533e7f08d29e4e726871579a710013c90dce57a5608a2b520aba758e92dd52de
font_01_sfnt_off0000c433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC433 10332 bytes
SHA-256: 14b1f71e735ccbf18bb26c5c1598d5493a95d757f8bcd099b713959646cc25da
font_02_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 16068 bytes
SHA-256: 11273ae8fae1fdd6f1ef685405aa24809e8907aa8ff7c84b2d15fc4bedf4a7f9

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