Malicious PDF — malware analysis report

Static analysis result for SHA-256 806e82b259b05c0d…

MALICIOUS

PDF

81.5 KB Created: 2021-03-18 13:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31bc5474bdd3fd6a6f906449485cba9c SHA-1: 70bcd0f199017f315f2dcebdd5eaa52bf170be36 SHA-256: 806e82b259b05c0dd68b9e40823e03dfa4aa951b5e19f83ff4d549c02195136c
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 are hosted on dynamic DNS services or appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malicious content via the embedded URLs.

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://ponafet.ru/wix?keyword=maths+mate+green+answers
    • https://darefosal.weebly.com/uploads/1/3/4/6/134601331/992f18d30630.pdf
    • https://xulozajewe.weebly.com/uploads/1/3/1/3/131384688/992d218896.pdf
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/nunalixezog.pdf
    • http://pagebake.com/characters_in_troilus_and_cressidanucan.pdf
    • https://tavadarikozo.weebly.com/uploads/1/3/5/9/135987174/pinuvo.pdf
    • https://bowefolezoz.weebly.com/uploads/1/3/1/4/131407704/84ce4182.pdf
    • https://xujoxufopugapes.weebly.com/uploads/1/3/1/3/131380539/320a683.pdf
    • http://shopmzm.site/ecommerce_logo_ideasr9o4n.pdf
    • https://kunagotuj.weebly.com/uploads/1/3/0/7/130739098/bukilelisezi.pdf
    • http://idealica-tufficiale.website/risazowikeridorojepag39dzh.pdf
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/8732270.pdf
    • http://help-nanny.site/tezereduwkzpy4.pdf
    • http://souve.me/kaxedaboguvubuzipubir4gdh7.pdf
    • https://buvujufa.weebly.com/uploads/1/3/1/3/131379824/7215482.pdf
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/fofijatuz.pdf
    • https://vugiwaxe.weebly.com/uploads/1/3/4/7/134739196/21e06f040ac0de2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_8d1045161ff44154bf631d07db683574.pdf?index=true
    • https://s3.amazonaws.com/xedewofuretujo/14726222913.pdf
    • https://s3.amazonaws.com/tamovagag/47750434071.pdf
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_7ee44dffeb6b4ea6848a9336389cc9e5.pdf?index=true
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_c3b5f53c0c084ccc91a357c6f8d38c9f.pdf?index=true
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_33a4a1b1cd6d4fae86e3340781fc4fac.pdf?index=true
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_65d88cfe95ca4a44905ace39bff26a01.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_off0000febe.bin
4a1598db89f8277ad26ac206f32482af840b8d146feb0d06705fccc2306902bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 5164 bytes
font_01_sfnt_off0001103d.bin
98753911353bbc0664a8a43d33c0c22bd84b39fa14380eabf17ac4dec065a65e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1103D 11636 bytes

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