Malicious PDF — malware analysis report

Static analysis result for SHA-256 08eef147d082487f…

MALICIOUS

PDF

79.2 KB Created: 2021-04-06 15:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b466fcb1c004def54284341a8ab409f SHA-1: 7e95b673f7242526bb16de381c57beff4ea048c5 SHA-256: 08eef147d082487f3fc1517e519aff774c5ce59452345c68e210af658df46e25
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains a large number of external links, many pointing to potentially malicious domains, suggesting an attempt to redirect users to harmful content. The document's metadata and embedded content indicate it was generated by wkhtmltopdf, likely as part of a SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crophysi.ru/strik?utm_term=amazon+best+sellers+video+games+ps4
    • https://cdn.sqhk.co/vifewaxupito/LRjgzW6/kritika_the_white_knights_wiki.pdf
    • http://tk-pobeda.site/76263419673q9kzp.pdf
    • https://bogogumufen.weebly.com/uploads/1/3/4/0/134018830/7c336b466958.pdf
    • https://cdn.sqhk.co/velijituma/ihjdjHE/universal_crossword_answers_june_14_2018.pdf
    • http://finovadi.iblogger.org/simexiwusakivutudegiwi.pdf
    • https://cdn.sqhk.co/zibepidok/eJTClwm/three_kingdoms_conqueror_generals.pdf
    • https://cdn.sqhk.co/buwuvibija/AwvhbJm/81472443956.pdf
    • https://cdn.sqhk.co/fiwujumejuf/eVggmje/vusul.pdf
    • https://sedogosep.weebly.com/uploads/1/3/4/4/134486754/6523374.pdf
    • http://dutov.org/how_do_you_use_a_masterbuilt_gas_smokerp53i0.pdf
    • https://cdn.sqhk.co/kasesiseb/exKhehd/busisuladesakuvadozisibet.pdf
    • https://duniterete.weebly.com/uploads/1/3/4/6/134690204/zuzobixuweronew.pdf
    • https://cdn.sqhk.co/kigimole/bTjhcjc/dabirelakivapidofosedut.pdf
    • https://vasidigugadojo.weebly.com/uploads/1/3/0/9/130969577/fccd6c40.pdf
    • https://cdn.sqhk.co/kozutani/Majfgia/xepasutugog.pdf
    • http://chempion.coffee/mudatevqaj82.pdf
    • https://cdn.sqhk.co/xeloxilava/79gdjgU/plus_messenger_mod_lite_apk.pdf
    • http://waxenotesanil.22web.org/dufusaguxow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/99277435-5c5a-41a7-949a-f56cd69e7a1c/trigonometry_questions_for_class_10_icse.pdf
    • http://retudazugo.rf.gd/fojap.pdf
    • http://sujunagew.epizy.com/abstract_reasoning_free.pdf
    • https://uploads.strikinglycdn.com/files/c340df87-89fd-4e4d-9789-aedaa6e48b01/86199440193.pdf
    • https://uploads.strikinglycdn.com/files/a2b5fe71-550b-4286-940c-4ed6f6aba3ba/canon_pixma_mg3520_ink.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_off0000f5f6.bin
a7faf944c8b3922e9d5ddd681142fc1332c7e4ceef9089a5449565089a03b81d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 5608 bytes
font_01_sfnt_off000108fc.bin
48420e8b8331feff09f22d94530a54e61c9d9e73486bb16920b980a6da31f973		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 11140 bytes

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