Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a00d8f6f296ca8…

MALICIOUS

PDF

65.4 KB Created: 2021-03-19 16:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 627c87f78b3172bf2741955b47f04e31 SHA-1: 994a654015c29b77f4cc6338fb8972040fffb172 SHA-256: f7a00d8f6f296ca823179af99248038d3477604f6d5f8259cd7f9bebff0169c2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The embedded document body is heavily obfuscated and does not provide clear instructions, but the overall structure and link distribution suggest an attempt to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9722

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://zajinet.ru/award?keyword=cutting+edge+starter+pdf+vk
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/1232492.pdf
    • https://cdn.sqhk.co/jirudumom/je2ggig/xisegavagitoxarofaxo.pdf
    • https://cdn.sqhk.co/wexufenu/j3hbhiy/imaginext_super_hero_flight_city_not_working.pdf
    • https://nobasaxekomu.weebly.com/uploads/1/3/5/3/135322761/pumupibeza.pdf
    • https://lerekisisag.weebly.com/uploads/1/3/1/4/131408666/dubonotid-wubewalavi-gililisisobeb-tumajubebom.pdf
    • http://zulesaxeririv.sportsontheweb.net/oscilloscope_guide.pdf
    • http://xuribof.medianewsonline.com/best_way_to_learn_arabic_as_an_english_speaking.pdf
    • http://lapiwudoxavov.scienceontheweb.net/89076454396.pdf
    • https://nuzudaguzawoj.weebly.com/uploads/1/3/4/7/134717590/najesifo.pdf
    • http://dedaruk.scienceontheweb.net/agricultural_revolution_in_europe.pdf
    • https://mivujekosos.weebly.com/uploads/1/3/1/6/131637271/4258b50573a44b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/276d6ca9-a587-4816-86bf-dfd7fe85c8a6/60601048615.pdf
    • http://zilisidojaze.myartsonline.com/xebolopulusirezimuli.pdf
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_d5f87c85665844d9b8e771a73aa51def.pdf?index=true
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_5375a9daa0b64c6a8dab0bd1273b7293.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3a7f8e10-54ae-4f7d-887c-d8b75f073939/62950574076.pdf
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_88746fec5465474e8f38efd60e990936.pdf?index=true
    • https://uploads.strikinglycdn.com/files/728f0e8f-897c-4757-829d-9005aba12e81/jipolozitizonemipapema.pdf
    • https://uploads.strikinglycdn.com/files/2876c9f5-71ea-4ad0-9986-8913b1fd2978/karcher_power_washer_wand_and_hose.pdf
    • https://uploads.strikinglycdn.com/files/b9c03a89-5398-4486-88ae-f1b48619a5a1/76781858605.pdf
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_2aee1c315611423797b0dbf43216f251.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e655.bin
cce239dee505527e6273d4199ece5d03274d9f177c16c2d31924cb1ff895e21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 5208 bytes

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