Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31aef6d106bca46…

MALICIOUS

PDF

67.5 KB Created: 2020-11-17 21:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d96bc37137fa4b6bd2c75fa2d9c1627f SHA-1: bb7e2a2ea7750cd1064fae7886c36a6a954b94e0 SHA-256: c31aef6d106bca46904d9c436c1d0fc76eaf372b0f4a27cbd013cf5a54461de5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with several pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/123?utm_term=song+of+storms+ocarina+of+time+n64 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455178/normal_5fadde1f4aa89.pdfIn PDF document text
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/e4b0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463533/normal_5fa3207bbf572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5f894198b148c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_5fa54ab68ebef.pdfIn PDF document text
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/8d100592526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385206/normal_5f9d591aac55b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f9a941754754.pdfIn PDF document text
    • https://bewejagaseti.weebly.com/uploads/1/3/4/7/134708857/6158395.pdfIn PDF document text
    • https://mavegisokelu.weebly.com/uploads/1/3/4/1/134131346/genawov.pdfIn PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/lixowupiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b05ae34c-c5d6-4514-8693-44a4cfd19a34/ziruwisifon.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/catcher_in_the_rye_time_period.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_off0000cb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB89 5512 bytes
SHA-256: 904cece4714fcfd412352f8eb637704dd3cf2d6ba2ea1e28bd9332492be285cd
font_01_sfnt_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 10312 bytes
SHA-256: 577ff46df80242fdeea5ccb792158a20c7bcac91a0b773613dd2210e96f12fb9

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