Malicious PDF — malware analysis report

Static analysis result for SHA-256 c545320c2c739374…

MALICIOUS

PDF

81.6 KB Created: 2020-11-18 20:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: df2e639d5fb8ef585d5f7bab34c9b185 SHA-1: 302b34ddf73293421464e6430a57588dc4ecb1e3 SHA-256: c545320c2c739374b5298e2ca616cb76aeecdee65ca2f42106853b21d36d807e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The primary URL, 'https://trafficel.ru/strik?utm_term=adobe+pdf+signature+validity+is+unknown', is presented as a lure. While no scripts were explicitly extracted, the PDF structure and the nature of the links strongly indicate a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection or further exploitation.

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/strik?utm_term=adobe+pdf+signature+validity+is+unknown PDF link annotation
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/9561993.pdfIn PDF document text
    • https://nukewixe.weebly.com/uploads/1/3/4/3/134385223/1689830.pdfIn PDF document text
    • https://dabamupusoga.weebly.com/uploads/1/3/4/2/134265366/2078876.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/naxid_mulabaxexod_fekuze_mibama.pdfIn PDF document text
    • https://tiludidiliduw.weebly.com/uploads/1/3/4/3/134385670/4400072.pdfIn PDF document text
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/9559373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_5f98f623c974e.pdfIn PDF document text
    • https://bofisolipog.weebly.com/uploads/1/3/4/4/134438855/2681984.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/1939535.pdfIn PDF document text
    • https://tanoviruxejalun.weebly.com/uploads/1/3/0/7/130775892/7141928.pdfIn PDF document text
    • https://pezumebudoko.weebly.com/uploads/1/3/4/6/134681460/3152630.pdfIn PDF document text
    • http://www.opentle.orgIn 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/88744f57-ddc6-41a7-8139-d9eb38175bf3/vejulisalivitunonuwokuf.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/65488009732.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/capitalization_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96af1d01-8e79-4b3b-9759-986bd537b32e/betep.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f08e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF08E 12872 bytes
SHA-256: 4e508346291e9a6f00e5321234a717effd1395f7d0e6447ae64c08d0ea7a3518
font_00_sfnt_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 5656 bytes
SHA-256: ca38e314c98b22d3349753cb5e622d15a9cf37f3e3fae897e7c85b5faf840df0
font_02_sfnt_off00011510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 10480 bytes
SHA-256: ca1d948a0694c714479b3fc6ea45b9b781b26b2ed8a4d7e01cf9c7f50426a41c

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