Malicious PDF — malware analysis report

Static analysis result for SHA-256 e692e9d401198e39…

MALICIOUS

PDF

73.3 KB Created: 2020-12-13 21:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b971d163ee00789cef19a91df0b33bee SHA-1: d7c9a1db5dfbf83b15d1d80c9ca32117d6a5b524 SHA-256: e692e9d401198e39e3a79d88892f8578eedca0a5824639f359afe083ea173189
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to unknown or potentially malicious domains, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=android+studio+project+files+missing
    • https://sekirodalod.weebly.com/uploads/1/3/4/6/134673836/sisewubed.pdf
    • https://redoperi.weebly.com/uploads/1/3/4/6/134686713/57177e756.pdf
    • https://jumegelizo.weebly.com/uploads/1/3/4/7/134712838/suxax-xisupugoxofimow-gadanofazutok.pdf
    • https://cdn-cms.f-static.net/uploads/4412591/normal_5fd1749e0f0e3.pdf
    • https://niliwavinifof.weebly.com/uploads/1/3/4/6/134687551/d44422865d59.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc50ba1a87939686422cdfb/t/5fd5ff84ab1a676c72839ff0/1607860100939/barcelona_map_metro.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe15c96457125654024c24/1606292942788/20321437686.pdf
    • https://uploads.strikinglycdn.com/files/00fce5cc-101b-40cb-8476-21fc262e6e40/44381205350.pdf
    • https://static1.squarespace.com/static/5fc4c58d68612547ed76cd6f/t/5fc67a709ee0f32b87345b04/1606842993121/73525799277.pdf
    • https://s3.amazonaws.com/jaloto/carousel_uniform_store_in_waldorf_md.pdf
    • https://uploads.strikinglycdn.com/files/7f795e2f-ffd5-4421-8dc8-2f04a876915a/20_poemas_de_amor_y_una_cancion_desesperada.pdf
    • https://s3.amazonaws.com/mokuwanibof/the_office_show_building_address.pdf
    • https://static1.squarespace.com/static/5fc0de27085bf90c0efce9ba/t/5fc134d361e25426e163d416/1606497491359/wuwupoparopafavonuweko.pdf
    • https://static1.squarespace.com/static/5fc3978f60f2895dc1f8b122/t/5fcbe61ba0b42e3566b599a8/1607198241746/turemozub.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_off0000e286.bin
91c2b131fff1da2b2a5e060ae67063129b6a1b4d14cddc775733d064b3626268		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 5332 bytes
font_01_sfnt_off0000f4a2.bin
c81fb173d6b8a0f113e00141e9dd923d692e1abb51222b26881d4ef6c8bfcec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 10424 bytes

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