Malicious PDF — malware analysis report

Static analysis result for SHA-256 eabb8ca83de17652…

MALICIOUS

PDF

77.5 KB Created: 2020-11-16 15:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c83cb2e18861984c042605b325d717b SHA-1: 786ecfa8588810b97851bd363cece07be8ac8909 SHA-256: eabb8ca83de17652440aef709ba0d9a336ebcc3a4dc9f3fb49139c1c4ae8c4f5
214 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including critical alerts for malicious redirector links and a link farm. The ML classifier also strongly indicates maliciousness. The embedded URLs, particularly 'https://gettraff.ru/123?utm_term=lawrence+township+public+schools+indiana', suggest a phishing or malware distribution attempt. The presence of numerous PDF links points towards a strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/123?utm_term=lawrence+township+public+schools+indiana
    • https://lewubudakaxawo.weebly.com/uploads/1/3/4/3/134342842/xonukelefosuwowugu.pdf
    • https://fofupapezu.weebly.com/uploads/1/3/4/3/134356394/62077.pdf
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5f962682309ea.pdf
    • https://cdn-cms.f-static.net/uploads/4453764/normal_5fa9498438748.pdf
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/nijijosawuwuz-nenopule-rozafi.pdf
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/punobinabesujodazufi.pdf
    • https://dinoromakutaxe.weebly.com/uploads/1/3/4/4/134479472/nudig.pdf
    • https://cdn-cms.f-static.net/uploads/4450147/normal_5fad6326e23dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bcfbc77a-f7fc-4455-ac12-691a6949fe7a/suvipeboxobigaramapajaw.pdf
    • https://uploads.strikinglycdn.com/files/7ce13a2d-91f1-47db-906b-8a308f093436/39927919197.pdf
    • https://uploads.strikinglycdn.com/files/8df0f46a-e4b0-4936-8c5b-42d111ac8201/genie_morman_incest_family.pdf
    • https://s3.amazonaws.com/nilafafakem/88083758160.pdf
    • https://uploads.strikinglycdn.com/files/b36af775-5906-44be-8153-83989a102bdf/gasofugotukuzoviwa.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_off0000f1c3.bin
f9354e682eafb461e79920abae6ec2c3edf81f5e7f20c53a71c1e05de3d1edbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 5336 bytes
font_01_sfnt_off000103e9.bin
e8147007d366d6935e0d52af85d16cc9925aa8468e9859c2474ca9856d93ef3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 10772 bytes

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