Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6d859f2f4c1857…

MALICIOUS

PDF

73.4 KB Created: 2020-12-24 05:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8321af7883b6a2335c26f8ca40b448d SHA-1: b6da938d911f3fc0f5bece82eb5116b8639f45b6 SHA-256: 3a6d859f2f4c1857166b681cda33e50c4a17250e71d4b06c5e4d0c45641859a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of these links, 'https://trafffe.ru/123?utm_term=bone+spicules+eye', is flagged as an external URI and is likely the primary malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or SEO abuse.

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://trafffe.ru/123?utm_term=bone+spicules+eye
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/givigugi_guzaba_gapagixopefif_gevugevatikita.pdf
    • https://static.s123-cdn-static.com/uploads/4464056/normal_5fd097b6c3615.pdf
    • https://cdn-cms.f-static.net/uploads/4480173/normal_5fb5daee90b8d.pdf
    • https://cdn-cms.f-static.net/uploads/4414868/normal_5fb6bc28cb7e8.pdf
    • https://renijavodis.weebly.com/uploads/1/3/4/7/134709946/e465bfdf79d73.pdf
    • https://cdn.sqhk.co/wemupaxuziv/J6jjOge/petelobajivakade.pdf
    • https://devomejot.weebly.com/uploads/1/3/4/4/134491467/547602.pdf
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/zuwirep.pdf
    • https://cdn-cms.f-static.net/uploads/4486201/normal_5fb85cdd7865e.pdf
    • https://cdn.sqhk.co/wemofisejaf/Oagf8tf/90003843965.pdf
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5f8e5a716bc3b.pdf
    • https://sevakozo.weebly.com/uploads/1/3/4/6/134677934/1881073.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bejokazemur/outline_notes_format.pdf
    • https://s3.amazonaws.com/vatosolikijike/maps_for_minecraft_apkpure.pdf
    • https://s3.amazonaws.com/pasawexawinogad/stupid_spreadsheet_meme.pdf
    • https://s3.amazonaws.com/falufusu/can_i_install_android_apps_on_chromebook.pdf
    • https://s3.amazonaws.com/ligole/2020_nashville_predators_schedule.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_off0000df99.bin
f9c119b2b70c99ad0f89d1f6844d5f26aa156b4fa9e090acb463172f268a5397
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 4772 bytes
font_01_sfnt_off0000effa.bin
91ea6562bffb5bb11f6a4ef11c7ffed6ff94ece8a834d77def403af4b8dafae8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 12044 bytes