Malicious PDF — malware analysis report

Static analysis result for SHA-256 7363cf1940fe2acb…

MALICIOUS

PDF

76.0 KB Created: 2020-12-30 23:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50af3c20ecc13edd8237ccb40af3bad7 SHA-1: 17d7d8effc664d0323b730aaaff6f3f9506d7b46 SHA-256: 7363cf1940fe2acbaf0e6d19018862acb9291ae45a5fd9030df1c897decc526f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary URL, 'https://trafffi.ru/123?utm_term=las+aventuras+de+huckleberry+finn+pdf', suggests a lure related to a book title to attract clicks. ClamAV and ML classifiers strongly indicate malicious content, consistent with a phishing or malware distribution scheme.

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-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://trafffi.ru/123?utm_term=las+aventuras+de+huckleberry+finn+pdf
    • https://forovaze.weebly.com/uploads/1/3/4/3/134315943/929ed9.pdf
    • https://cdn.sqhk.co/pozuwifofub/eahdWEj/car_oxygen_sensor_testing.pdf
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/gejatafekasodine.pdf
    • https://cdn.sqhk.co/momajuxu/g6Wgiha/venus_flytrap_care_outdoor.pdf
    • https://cdn.sqhk.co/fosulavale/jdCRhfy/29242545180.pdf
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/2378943.pdf
    • https://cdn.sqhk.co/moviferu/Y4vIjam/87085993992.pdf
    • https://cdn.sqhk.co/wediximewoza/gcQghig/megan_is_missing_netflix_2018.pdf
    • https://cdn-cms.f-static.net/uploads/4448337/normal_5fa41fc79a657.pdf
    • https://cdn.sqhk.co/gawukale/VBff7yr/lokegipawafuwe.pdf
    • https://nanivenom.weebly.com/uploads/1/3/0/9/130969334/4605911.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvevanepen/keto_diet_grocery_list_printable.pdf
    • https://s3.amazonaws.com/patilawasu/laxegitokovixa.pdf
    • https://s3.amazonaws.com/gupawupigawono/sisunerasasifibala.pdf
    • https://s3.amazonaws.com/zetituri/25339351817.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_off0000ebfa.bin
6887a8eb39aa978464c8441d7a19b55a671366b6b0b3ded8e0b9dc4ca28dbf8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 5548 bytes
font_01_sfnt_off0000fede.bin
6e5ebab9107226c3b2ffbf797cf63b701b567c7fd5e9c0c6db116f535c2283ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 10424 bytes