Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d908f657b93519c…

MALICIOUS

PDF

71.0 KB Created: 2020-11-10 20:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f1c8e3e8831c346aba0b051119758e7 SHA-1: d145807c699ac969d2d72f76b92bdff5f1942550 SHA-256: 8d908f657b93519c1eb0ed2ae14bae7eae2cdedd627b88e6b168e6aa72167731
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The primary URL, 'https://trafficel.ru/123?keyword=harry+potter+books+in+order+1-7', is presented as a search result, likely to trick users into clicking. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?keyword=harry+potter+books+in+order+1-7
    • https://fenagedel.weebly.com/uploads/1/3/4/3/134316540/wavabugalok.pdf
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/gopebisodix.pdf
    • https://miboxijudowisu.weebly.com/uploads/1/3/4/4/134491333/runuxanawebadepamo.pdf
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/vumusuzogo-fikuxonizobosi-banuzus-gelofofenuzoto.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/xenemavurinap_jokepirewiteda_fijalezej_gemewije.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jijumupade/jewigenomofogizifubo.pdf
    • https://s3.amazonaws.com/pozokimepe/glaze_business_plan_download.pdf
    • https://s3.amazonaws.com/gupawupigawono/30346167425.pdf
    • https://s3.amazonaws.com/mijedusovineti/87903872261.pdf
    • https://uploads.strikinglycdn.com/files/ab920e93-30dd-4ca9-8dad-8951448a8f89/neo_geo_emulator_for_pc.pdf
    • https://s3.amazonaws.com/migivewuwe/regegazafukujaxep.pdf
    • https://s3.amazonaws.com/salade/45101047870.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_off0000d8fe.bin
25dcbf463c262b0a889725ad5260881d8fe42721beba1280703492feeaa3067a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 5352 bytes
font_01_sfnt_off0000eb51.bin
f37fed62bb20f88cd6a3604c2142a0190c39290cf9dc37423e15ce272c3a8287
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 10636 bytes