Malicious PDF — malware analysis report

Static analysis result for SHA-256 306d139816df2a44…

MALICIOUS

PDF

71.6 KB Created: 2020-11-18 06:09:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a25611d7f4a861df76815911376b1859 SHA-1: ee6c2e30b4ccae97e1d25ceea1c8bb95010a41e9 SHA-256: 306d139816df2a44960587d7c6c1e9f38505846fef2b478d3f9d036570cbfd53
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 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature, flagging it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a phishing or malicious redirection attack.

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-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://traffking.ru/123?utm_term=zinc+chromate+primer
    • https://cdn-cms.f-static.net/uploads/4416318/normal_5f9965b0843e7.pdf
    • https://nevonanopovew.weebly.com/uploads/1/3/4/3/134335048/03ed8f8093ae69.pdf
    • https://vezexozozufizus.weebly.com/uploads/1/3/4/3/134372857/naxojula.pdf
    • https://cdn-cms.f-static.net/uploads/4384323/normal_5fa0d1b4daa5c.pdf
    • https://bosesabefo.weebly.com/uploads/1/3/4/3/134362720/woluxa.pdf
    • https://busozovamifolak.weebly.com/uploads/1/3/4/2/134235369/livowagum-nedexibi-butiki.pdf
    • https://kedetasogo.weebly.com/uploads/1/3/4/5/134599644/kuxepikewe_peral_jofafatedopiziz_fokod.pdf
    • https://cdn-cms.f-static.net/uploads/4495696/normal_5faaf62be49dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remufuzu/certified_arborist_study_guide.pdf
    • https://s3.amazonaws.com/jenisozazewubo/holonomic_drive_systems.pdf
    • https://s3.amazonaws.com/fatikonavori/worksheet_4_the_composition_of_blood_answers.pdf
    • https://s3.amazonaws.com/lorifawuvawot/animal_crossing_happy_home_designer_pc.pdf
    • https://s3.amazonaws.com/votawawo/muxelutuw.pdf
    • https://s3.amazonaws.com/tobojelusiwi/38076993116.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_off0000dddc.bin
051bf8630c3014e4b1b4496f07d2ea5d9472b5cb95eef802d75b0bdc1a1ab3b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 4920 bytes
font_01_sfnt_off0000ee6f.bin
3403e0424f18924260b436a64ce60bd1e22a65e4684a210ef1956edb3da0a029
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 10320 bytes