Malicious PDF — malware analysis report

Static analysis result for SHA-256 70aba95dd2708608…

MALICIOUS

PDF

72.0 KB Created: 2020-11-11 13:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9b93e92929cac3525b7eb426f78b62b SHA-1: 56ac0c7f8dc0b8631aea044592163a0c8e9e097a SHA-256: 70aba95dd2708608e6e05bb2b023f6bf0bb5472142afb09d8955a25432209c19
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with the heuristic 'PDF_SEO_LINK_FARM' specifically identifying a large number of links, suggesting a tactic to distribute malware or engage in phishing. The presence of embedded URLs further supports the attack pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?keyword=apush+chapter+24+multiple+choice
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/wamolusumafojukawa.pdf
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/264294.pdf
    • https://zenovoruzunej.weebly.com/uploads/1/3/4/3/134339910/9779446.pdf
    • https://gatixitawenubik.weebly.com/uploads/1/3/4/6/134643062/4784948.pdf
    • https://juzomewe.weebly.com/uploads/1/3/4/3/134350864/sagakinin.pdf
    • https://lufufalab.weebly.com/uploads/1/3/4/6/134634403/vomopamabisegijex.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/larubixepoleku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lokijuronig/history_of_coding_wikipedia.pdf
    • https://s3.amazonaws.com/jifesu/81210836385.pdf
    • https://uploads.strikinglycdn.com/files/07437470-9192-4dd2-9d83-55db9e49f4bb/81129751190.pdf
    • https://s3.amazonaws.com/zafaronivaj/m20_book_of_secrets.pdf
    • https://uploads.strikinglycdn.com/files/f344a51f-953a-4bf7-b678-67bc5127dc5c/kudukajinizerok.pdf
    • https://s3.amazonaws.com/sezebepit/b20_crankshaft_torque_specs.pdf
    • https://s3.amazonaws.com/sakaburepagase/mortgage_broker_fee_agreement.pdf
    • https://s3.amazonaws.com/leguvefu/l_argumentation_juridique_stefan_goltzberg.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_off0000df30.bin
477351b05d676ae9bc071cd2d94ab41043a53469811a4f29a371abd1a0666932
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 5384 bytes
font_01_sfnt_off0000f156.bin
10492096ffefec764a66e2b8d7e29053e4aa63767b1b7852a23cd8e73c27aebc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 9876 bytes