Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ed2233fa1a4e57…

MALICIOUS

PDF

58.9 KB Created: 2020-11-14 12:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c16f7dd450240ac6af46842428e486c5 SHA-1: d0b4a5ad5da9203b494115bf365022063e380e9b SHA-256: a5ed2233fa1a4e57c7fd082a77fd999f46ddb808fa56a84802217774d8a1cc87
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking documents, but also includes a link to 'traffking.ru', which is likely malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/123?utm_term=boneless+girl+unblocked
    • https://cdn-cms.f-static.net/uploads/4376850/normal_5fa34420d7091.pdf
    • https://xajoxivanuxus.weebly.com/uploads/1/3/4/4/134432241/mogakabub.pdf
    • https://lurabesuweki.weebly.com/uploads/1/3/4/5/134524451/xewajebogib.pdf
    • https://fimopokiwuzik.weebly.com/uploads/1/3/4/7/134736862/nupubun.pdf
    • https://cdn-cms.f-static.net/uploads/4457881/normal_5fab7d2425231.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/migivewuwe/triangle_interior_angles_worksheet.pdf
    • https://s3.amazonaws.com/fulosobezur/1988_bassett_crib_assembly_instructions.pdf
    • https://s3.amazonaws.com/jiwisigetizoxif/74727498620.pdf
    • https://s3.amazonaws.com/tumasun/st_landry_parish_assessor_race.pdf
    • https://s3.amazonaws.com/jovekus/4545716167.pdf
    • https://s3.amazonaws.com/wofaxil/micro_clash_of_clans_hack_apk.pdf
    • https://s3.amazonaws.com/zuxadol/46861105035.pdf
    • https://uploads.strikinglycdn.com/files/1b3dbdea-22de-45d3-992a-dbe28de305c9/fupuberareki.pdf
    • https://uploads.strikinglycdn.com/files/2ba59694-6081-4d00-9297-9f2f735eac33/myers_briggs_worksheet.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_off0000ad39.bin
88a868f4becb9f90b211fa74d90c74f1653edfc755c6d2e43ea453d240af17d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD39 5152 bytes
font_01_sfnt_off0000bed5.bin
8f401ab26297b115f9193c2a1c49611b837348b12e4a50d80e82bed517b6e8a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBED5 9448 bytes