Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa65bed0feadb5be…

MALICIOUS

PDF

70.3 KB Created: 2020-11-30 18:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 178f2bcac877f3c13ecc0afec619df42 SHA-1: d4b961d57d3b69286ad0b9e47dc816d747f8a664 SHA-256: aa65bed0feadb5befa8c8b620b8489d3672348b4163a8331d48590caab1228bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a large external link farm and a high ML score. ClamAV identified it as a phishing trojan. The embedded URL points to a suspicious domain, and the PDF structure suggests it's designed to host numerous links, potentially for SEO abuse or 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://trafftec.ru/123?utm_term=what+is+an+upper+decker
    • https://cdn-cms.f-static.net/uploads/4425726/normal_5f9d8bc561560.pdf
    • https://zonebudufekepok.weebly.com/uploads/1/3/4/3/134382159/fed2b221c510b73.pdf
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/bb427ecff126227.pdf
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5fbc9b43af325.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tezude/kifetakamerabaz.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf50966457125654315466/1606373528112/nikon_action_binoculars_8x40.pdf
    • https://static1.squarespace.com/static/5fc0df209955c744b53b696b/t/5fc1634b2dd96f5918236471/1606509388588/91970977736.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe07e33c6ccf69f325a514/1606289379094/75224331478.pdf
    • https://static1.squarespace.com/static/5fc0e88b8139af0376454bd0/t/5fc45df1145a8629dc3c4faa/1606704626098/77735249562.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfa878bc8713fe6fd98bc/1606220424486/sten_mk2_build_instructions.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4da018e72e5fdbce0b85/1606372769297/minecraft_crossbow_enchantments.pdf
    • https://static1.squarespace.com/static/5fc1559bc6d9645836252c59/t/5fc2ae2d173fb5383bfb22bf/1606594093564/gajuxado.pdf
    • https://static1.squarespace.com/static/5fc2c6032e34347c70505203/t/5fc51063f81c9a2a0c42ee98/1606750308791/el_jorobado_de_notre_dame_doblaje.pdf
    • https://static1.squarespace.com/static/5fc00c29085bf90c0ef85582/t/5fc195559d79364840c99709/1606522197576/89372434337.pdf
    • https://static1.squarespace.com/static/5fbfd6e2c6d96458361c2338/t/5fc4aa19f3de5e49b5f8da45/1606724121956/nobasijar.pdf
    • https://s3.amazonaws.com/tejuvonixag/buffalo_nas_navigator_uk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc57.bin
10bf7ab7b90e94ea07644463e086fcc4b1330a90eb948490ae03a9e72103340b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC57 5208 bytes
font_01_sfnt_off0000de0a.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 1800 bytes
font_02_sfnt_off0000e697.bin
68d7f242291a38523ec834b4a6494c0234bdda0d0bb5ef74065637cbb94ba984		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 11016 bytes

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