Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7e0c1c914ed552…

MALICIOUS

PDF

77.4 KB Created: 2021-03-29 17:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30ed860e7ff90d084e190acee71749d1 SHA-1: 70e0723178841dd8f95faf63fd993481acfe2768 SHA-256: cf7e0c1c914ed552d87ca6830d4a1c46ddd36d5fcf7f3b0b54250e8ebfddc603
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the linked URLs. The document body is heavily obfuscated and appears to be junk data, further supporting the malicious nature of the file.

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://druttle.ru/wix?keyword=okawville+grade+school+lunch+menu
    • https://cdn.sqhk.co/zetikitor/hfggjj4/the_pirate_plague_of_the_dead_hack_mod.pdf
    • https://cdn.sqhk.co/rarukaboz/Y6kgie5/22951995187.pdf
    • https://tovujitirufozi.weebly.com/uploads/1/3/4/8/134853008/66cc74bd.pdf
    • https://gekonoxare.weebly.com/uploads/1/3/4/4/134480638/91d1428a.pdf
    • https://cdn.sqhk.co/mawejoxejobe/cuCFSid/jizedol.pdf
    • http://fastgetme.online/68173472784vtt2n.pdf
    • https://jimuvidagonolab.weebly.com/uploads/1/3/1/6/131636746/poparina-zuwadimom.pdf
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/3672629.pdf
    • http://domastmsk.space/dodilakovadekefimuligiv73yla.pdf
    • https://cdn.sqhk.co/mojafefegamo/DkicUPT/pumixiligix.pdf
    • https://sixifemawo.weebly.com/uploads/1/3/4/4/134470876/vizovepov_fazited_vupumuxixas_bemisidujesixa.pdf
    • http://idealica-uficiale.website/tibomomut6vi.pdf
    • https://kulegireketo.weebly.com/uploads/1/3/5/3/135325025/908213.pdf
    • https://biwurozijusuxux.weebly.com/uploads/1/3/4/7/134724143/e3d2ea4.pdf
    • https://gososeru.weebly.com/uploads/1/3/4/5/134597059/rifilijiguzoda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/232bfbb9-5086-4745-ba86-6c10b848ca96/73153824534.pdf
    • https://uploads.strikinglycdn.com/files/08c1ef34-5846-4908-bc3e-84b0c0600c5e/15042175978.pdf
    • https://uploads.strikinglycdn.com/files/071c2804-f0c7-4eb9-9e7b-2fbc7cb80462/introduction_to_wireless_telecommunication_systems_and_networks_mullet_free_download.pdf
    • https://uploads.strikinglycdn.com/files/f95f2802-d09d-4137-9382-b4406719f6b2/rinirimolam.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_off0000f2b7.bin
aaa4cbe846d43fcbce45dac41b10e301d5795b02ec7680a2faa57b71dfbd5dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 5596 bytes
font_01_sfnt_off000105b7.bin
cccdd9b379ee5887b9dba05d686afaa78d1864426ba065c787543c61cba7e325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 10244 bytes

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