Malicious PDF — malware analysis report

Static analysis result for SHA-256 22352b40d68693ee…

MALICIOUS

PDF

74.7 KB Created: 2020-12-10 02:02:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 57a89205d4d5c66a16d8154634a17d33 SHA-1: 118548d2611d738465ec86b538feedb7048cf506 SHA-256: 22352b40d68693eebf16042dd98e28b4de10f314c8d9dd02b10c409117db8b13
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=battle+of+guam+1941 PDF link annotation
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/sibutoti.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/kopate-gosuxe-kuzebuli.pdfIn PDF document text
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/113d27c.pdfIn PDF document text
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/tisawo-rurelug-tevubikipigu.pdfIn PDF document text
    • https://linowatudevenur.weebly.com/uploads/1/3/4/5/134599813/suwid.pdfIn PDF document text
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/680a36c26.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/2515491.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/nisidobesafil-pirawibas-tisolo-xuwawovubimobop.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/nifoni.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/9ecd6635-8cf0-43a7-9d3a-a98a69ebab54/silodefiboju.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/engineering_drawing_n2_past_papers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76bb23de-7c69-45e0-ba96-555691bb50a3/78614276118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/814884c4-8e83-421a-9a1a-016b6c7be80a/sinkmaster_bonecrusher_950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b380d6-a7e1-4a47-a008-5bf50a1642c5/suzigarenufefivumikedom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0135dfa-a38c-4204-857d-3e9e0df4fc70/zoludalalizoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02619f29-a1f7-4617-a30f-6b2e8e054761/lilojatura.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_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 5160 bytes
SHA-256: fb1b40c17be486c35cce4ef55752e0e05d69c76f01a703a5d001d960ccf7f3a9
font_01_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10592 bytes
SHA-256: 162ecc6d94f770a6347e1ebc657b8f3f909363c6877cac0defa817959719c488

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