Malicious PDF — malware analysis report

Static analysis result for SHA-256 9055cbcd7a9f8df8…

MALICIOUS

PDF

72.4 KB Created: 2021-01-26 09:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 90336e3adb09538e30ad93b2dffe8418 SHA-1: e903c550a50bb769b6bdfa5c32a399e8a2bee6a2 SHA-256: 9055cbcd7a9f8df827ada434f5bde0331c457416144d45e55acfde5ae51ae89b
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with the primary suspicious URL being traffset.ru. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/wb?keyword=minecraft%20pocket%20edition%20online%20servers PDF link annotation
    • https://cdn.sqhk.co/fobonelaga/uFhdBlH/pinnacle_stackable_washer_and_dryer_for_rv.pdfIn PDF document text
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/favisipowobimibi.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/8jfid28/fadivujib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393635/normal_60024a07029d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_5fdaef8dba325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466675/normal_5fc8fe913e2db.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/7ehjgjt/pollmann_kontrabass_zu_verkaufen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483335/normal_60032fe453397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457272/normal_6003f7d91fc68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/30940946504.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/city_caller_id_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/54375282825.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/total_dissolved_solids_in_water_lab_report.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_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 5280 bytes
SHA-256: a00f8116e53b7a7de0afc14899ef264816d81098ef1572e43859c532618ed072
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 10608 bytes
SHA-256: e605e82a650a7e670069b0552ef6c212aa523b47bdb4e08dedeecf1ef06714d0

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