Malicious PDF — malware analysis report

Static analysis result for SHA-256 71642631cd7cbd90…

MALICIOUS

PDF

80.7 KB Created: 2021-05-24 16:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb4756a4215c9d2468dee22fb82e1934 SHA-1: 22378043aa02e55c1a3cc300004dc2862584ab73 SHA-256: 71642631cd7cbd9006f244734c85fc5bcd96fcc951cee91d011057f523dc2b72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it is part of a link farm designed to direct users to malicious websites. The primary malicious URL identified is https://nipisod.ru/strik?utm_term=resumen+del+libro+la+divina+comedia+por+capitulos, which is likely used to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=resumen+del+libro+la+divina+comedia+por+capitulos
    • https://cdn-cms.f-static.net/uploads/4394061/normal_602c781dbffcf.pdf
    • https://cdn-cms.f-static.net/uploads/4458412/normal_601dfcd08b319.pdf
    • https://diwimiwiwomenen.weebly.com/uploads/1/3/0/9/130969795/7136003.pdf
    • https://cdn-cms.f-static.net/uploads/4486356/normal_6036d94235ca1.pdf
    • https://nalodewemutut.weebly.com/uploads/1/3/1/1/131164475/60102e.pdf
    • https://cdn-cms.f-static.net/uploads/4481280/normal_6046604998e80.pdf
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/5889160.pdf
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/ec8c1.pdf
    • https://static.s123-cdn-static.com/uploads/4476011/normal_5fe3ade8831a3.pdf
    • https://miwavexirafixi.weebly.com/uploads/1/3/4/4/134495851/637d4a75592.pdf
    • https://wobafelu.weebly.com/uploads/1/3/4/6/134613510/ededbcc2.pdf
    • https://zejabunu.weebly.com/uploads/1/3/4/7/134719965/vimogozeruwexix.pdf
    • https://rewegabelera.weebly.com/uploads/1/3/5/3/135390500/8610817.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d8a00ad-b688-4414-aeae-11f00d142948/stihl_ms180c_chainsaw_how_to_start.pdf
    • https://uploads.strikinglycdn.com/files/97851994-4295-437d-bbcb-125220000c9e/51193322945.pdf
    • https://uploads.strikinglycdn.com/files/75051349-6cae-4168-96e9-a3882fc8bf9a/peavey_vypyr_15_amp_settings.pdf
    • https://uploads.strikinglycdn.com/files/4e0df874-3469-46e9-889d-d37dcfdf4f08/bosijodofe.pdf
    • https://uploads.strikinglycdn.com/files/4b679d90-1124-4f4d-8e2c-bf80e6aa2eb6/nijekinexopixanumejed.pdf
    • https://uploads.strikinglycdn.com/files/b564ff9c-a4c6-40ff-b239-9419976aa7b5/sanomudofe.pdf
    • https://uploads.strikinglycdn.com/files/06158a50-4940-4983-9822-4822e1279b04/how_do_i_setup_my_netgear_wifi_extender_as_an_access_point.pdf
    • https://uploads.strikinglycdn.com/files/7ed50d54-28e2-4c85-b2f1-f6895af53b73/how_to_relieve_neck_pain_from_scoliosis.pdf
    • https://uploads.strikinglycdn.com/files/e9ca8107-76bf-4b8b-a784-4bb37e356c66/bosch_silence_plus_46_dba_how_to_start.pdf
    • https://uploads.strikinglycdn.com/files/02bd580c-fa8a-4878-b5fc-3a3dc1aa3008/how_long_do_you_roast_a_ham_for.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_off0000fcbd.bin
83c79691f72e4cc2c3e59beb8b756fc23d7826c5e2da872cbd3e24e1bfcc1996		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 5428 bytes
font_01_sfnt_off00010f19.bin
988821e5a54e2752fc7bd10416ccd017e9dcdd91d0b030bd678a92945f57caa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 11212 bytes

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