Malicious PDF — malware analysis report

Static analysis result for SHA-256 3441f62a83bb9bf0…

MALICIOUS

PDF

68.4 KB Created: 2021-03-15 07:39:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e426893094398c921958d748d364c036 SHA-1: d5e02959cb3d3a3b1d529318033c8fdf77b0b5df SHA-256: 3441f62a83bb9bf0017bbe10170a093dbb9c07278bbf9555695fe014d0e6301f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing lures, with one prominent URL pointing to 'mezovuduw.ru'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external links suggests the PDF is designed to redirect the user to a potentially harmful website.

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://mezovuduw.ru/wix?keyword=wii+fit+operations+manual
    • https://cdn-cms.f-static.net/uploads/4402737/normal_604b50af8f127.pdf
    • https://cdn-cms.f-static.net/uploads/4476578/normal_60245508de39d.pdf
    • https://cdn-cms.f-static.net/uploads/4461249/normal_604e74a7a5105.pdf
    • https://cdn-cms.f-static.net/uploads/4368952/normal_6029e9595bd87.pdf
    • https://static.s123-cdn-static.com/uploads/4470832/normal_6006527403684.pdf
    • http://rufamegepijuwo.22web.org/etapas_de_la_auditoria_financiera.pdf
    • http://bosaboro.22web.org/kegorunigaketenizajan.pdf
    • https://cdn-cms.f-static.net/uploads/4501632/normal_6047c52346049.pdf
    • https://cdn-cms.f-static.net/uploads/4491152/normal_5fe9a87da1a86.pdf
    • http://nizuxep.iblogger.org/how_oxygen_is_released_during_photosynthesis.pdf
    • https://cdn-cms.f-static.net/uploads/4481280/normal_604b2639a6d46.pdf
    • https://cdn-cms.f-static.net/uploads/4374368/normal_6020afefb824d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_1b89c39eb30a4142aa5342109792b04a.pdf?index=true
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_94a60c7487cc4f1dac6d98f429389e6b.pdf?index=true
    • http://fiwujugisijema.epizy.com/asp.net_mvc_4.0_update.pdf
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_a6c8adb4c456411ead4eae9eebeedf49.pdf?index=true
    • http://jivatufuwofed.rf.gd/casio_g-shock_sports_model_ga110-1aos.pdf
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_7e71c56fee624847a12bfad8868a4e96.pdf?index=true
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_7fd93e5b849242e6b98eef3e6b98cd62.pdf?index=true
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_d5b8f0119a214883a141475bae820602.pdf?index=true
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_5eb04578217c4d918f83f89a3a95ddaf.pdf?index=true
    • 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_off0000cf88.bin
500ca94708e3975653163bd871fb6c9bc9668ea27a2954bf6258f2bbaaa5b869		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF88 5060 bytes
font_01_sfnt_off0000e0b5.bin
0866289887de07b8ab1a1ac6cfeb1daf9345b65d68ee7c9ae8b79e8bd4ffff16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 10608 bytes

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