Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec1ffc2456fa30d…

MALICIOUS

PDF

91.5 KB Created: 2021-05-22 01:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecab6c48170c18801c93d8a2bdc5396c SHA-1: 9d0b3042d9d799795859324446f96383bd57e0c9 SHA-256: cec1ffc2456fa30d72c84a87b09b5da119e01735cbd4c2f129561465b32281a9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=test+20+chapter+5+test+geometry+answers+houghton+mifflin+sheet+27
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/puletob_betugutarinifa_jupobevelikedol_zafelofer.pdf
    • https://cdn-cms.f-static.net/uploads/4369164/normal_603b7203f20f3.pdf
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5fef99febb6ed.pdf
    • https://cdn-cms.f-static.net/uploads/4480589/normal_6043b1be96438.pdf
    • https://xefinaloze.weebly.com/uploads/1/3/2/8/132814425/xogegiko-misivokut-wigimodoxezite-gujiwunojomidu.pdf
    • https://static.s123-cdn-static.com/uploads/4485578/normal_60041b3044f97.pdf
    • https://static.s123-cdn-static.com/uploads/4378608/normal_5feed31390c62.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a8422aa3-1409-4d1c-a8bb-323b31900dac/rarogo.pdf
    • https://s3.amazonaws.com/bubeto/jexiditefifolimuzalu.pdf
    • https://s3.amazonaws.com/zepifudoxapo/wukijimowoxevunanixiloker.pdf
    • https://uploads.strikinglycdn.com/files/3301ec48-08d2-456a-a6ad-e83cb870be99/cisco_linksys_ea4500_software_download.pdf
    • https://uploads.strikinglycdn.com/files/0d660592-7d26-4290-b193-779c48ea06ec/37566690037.pdf
    • https://uploads.strikinglycdn.com/files/03751eaa-d9dd-4b2f-adba-cde59183b64d/76660422765.pdf
    • https://uploads.strikinglycdn.com/files/a3c11967-924e-49e4-806f-c36c9da2b382/twas_the_night_before_christmas_to_read_online.pdf
    • https://uploads.strikinglycdn.com/files/be47bb61-c122-420f-98f1-488531b8ba55/lista_de_verbos_regulares_e_irregulares_en_espaol_para_imprimir.pdf
    • https://s3.amazonaws.com/tipikaxe/68670358056.pdf
    • https://uploads.strikinglycdn.com/files/e597caae-b7f5-4686-a710-6d8780222e76/learn_tableau_reddit.pdf
    • https://uploads.strikinglycdn.com/files/ca1655c3-8adf-4127-a514-21a3be62f9ce/lubodevibevalijakigiluzi.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/80664535129.pdf
    • https://uploads.strikinglycdn.com/files/99d63d6b-9b14-44b6-8869-160787a4a4f1/samsung_galaxy_a2_core_problems.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d1c.bin
69918bf4e40355683fd8706f9e17c3cb1191e951bcc5e30c534c70ca3ff4eb6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 6052 bytes
font_01_sfnt_off000121b3.bin
f2698ce15a6538589afc75ec747f5983e1fb810654299b3e00e377fa7ac1338c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 12424 bytes
font_02_sfnt_off00014b34.bin
8d2a5d652813a73a53b55a4585605ab8804d0656644c3cd70d001ca0e7547f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B34 16120 bytes

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