Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f934a3bebf7a79…

MALICIOUS

PDF

69.3 KB Created: 2020-12-22 01:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28bb0359c418c9709cbd820bb51e4da7 SHA-1: defdb91440fe4b62b0d4fbc69f3ddd8e61c025da SHA-256: 09f934a3bebf7a792361083772a39677c806c0037d7613c230a6205fa43de4b6
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The embedded URLs, such as 'https://traffine.ru/strik?utm_term=strickland%2527+s+ice+cream+triplett+boulevard' and 'https://jaregufadux.weebly.com/uploads/1/3/4/0/134016720/6507419.pdf', are key indicators of this malicious activity.

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://traffine.ru/strik?utm_term=strickland%2527+s+ice+cream+triplett+boulevard
    • https://jaregufadux.weebly.com/uploads/1/3/4/0/134016720/6507419.pdf
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/5849510.pdf
    • https://kubazabuz.weebly.com/uploads/1/3/4/8/134885093/butujopijikuzetude.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/midaguvimabof/systems_approach_to_management_theory.pdf
    • https://uploads.strikinglycdn.com/files/e345ec67-f42a-4518-a18f-346ffe15d885/avent_bottle_microwave_sterilizer_manual.pdf
    • https://uploads.strikinglycdn.com/files/de9ebdaa-1136-4b8a-81ac-555f19e12529/slim_pro_patch_does_it_work.pdf
    • https://static1.squarespace.com/static/5fc656c012facd59ced21f8d/t/5fc9fcf52e4d7f67ca2f92d6/1607073015571/multiplayer_for_minecraft_pe_app.pdf
    • https://uploads.strikinglycdn.com/files/07e9da0b-e6b3-4fd4-99e7-91e2beca5bec/76017726524.pdf
    • https://uploads.strikinglycdn.com/files/c59c8152-5b0b-4d71-bc7c-fbcfefff60ec/ffxiv_ucob_guide.pdf
    • https://uploads.strikinglycdn.com/files/69217a76-7cc6-417d-837a-3b71b3c503d4/ark_assault_rifle_blueprint.pdf
    • https://static1.squarespace.com/static/5fc0d2f2d26ff1194f734ddd/t/5fc12eecf3de5e49b58f2214/1606495981538/dianetics_the_modern_science_of_mental_health.pdf
    • https://uploads.strikinglycdn.com/files/96d137a3-f226-4f86-8dba-808b8fb6af78/90358902451.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_off0000d1dc.bin
6a4adaaf47d6a1c97407bd9e95c60811b405e06fce2687f3d359f0877a10728b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 5620 bytes
font_01_sfnt_off0000e4ea.bin
ba973a2b0a8722d0443ea2fe48acde48d750632ca9a4602d9b8d00a952edcea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 10312 bytes

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