Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e0c85cd68efa3d…

MALICIOUS

PDF

72.8 KB Created: 2020-12-22 23:56:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6e8aafc23c5279b01a2782f7225771b SHA-1: d9e021ad7332546e03ec597b9fc15e3b9f2b5da8 SHA-256: a9e0c85cd68efa3de9234c80e43ee8388addde740fe72e465b3f362902e7c8dc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on Weebly and other platforms. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious or phishing content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=fear+the+walking+dead+season+4+episode+14
    • https://mewopaxa.weebly.com/uploads/1/3/4/8/134848883/buper.pdf
    • https://mufawazaxomet.weebly.com/uploads/1/3/4/7/134764665/riwolomu-vesawovamoke-rozunagug.pdf
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f8e5ab4cbe3a.pdf
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/fa864f41c.pdf
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/vokategokow.pdf
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/86cdb.pdf
    • https://cdn-cms.f-static.net/uploads/4422390/normal_5fa7f9e781508.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b5a17e93-168f-4721-bdd1-a8fa22bedc0c/the_village_hidden_in_the_leaves.pdf
    • https://uploads.strikinglycdn.com/files/fa5655b4-49a3-4554-82a7-e9b165e9b5e3/29567566877.pdf
    • https://s3.amazonaws.com/vuraradaso/9676234297.pdf
    • https://static1.squarespace.com/static/5fdec22607af9e0e16fda9dc/t/5fdf3b9f1c66f52f5f996b95/1608465312008/wekoneg.pdf
    • https://uploads.strikinglycdn.com/files/95fb3041-a6b2-445f-b57d-40c99ed8cd47/45677870206.pdf
    • https://static1.squarespace.com/static/5fdd5508eb685147a09c9c9e/t/5fde55ab892c8943b0a9925b/1608406443884/chamma_chamma_song_djpunjab.pdf
    • https://s3.amazonaws.com/laradusa/15406504167.pdf
    • https://uploads.strikinglycdn.com/files/ceecf8f1-6f0b-4743-9a3d-c4311c412598/church_history_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/abd9ee7a-1cc6-4256-a874-d03ec01e2264/makofivilomux.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedd.bin
d9b80aad734f1febe0e1ffbbdb4cf6d384fc9f7e84c94aba3b0e7b19f1d82a54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDD 5472 bytes
font_01_sfnt_off0000f19b.bin
18f7f86989ae218d38a2eb08b6180dca1c91a280e9288f5a423f741a35013ea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 10608 bytes

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