Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5bba7c208e919d…

MALICIOUS

PDF

83.2 KB Created: 2021-03-20 20:09:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 496dbc005fc3f65d964f3c3173dbdf5f SHA-1: d4ba0fc108c50e262ff3da5bc2c3d16d9d9de9e7 SHA-256: aa5bba7c208e919dac8b42177f038732e8ddd667cfaed8f5f38ff333038cd53c
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to manipulate search engine results. The embedded URL `https://vilenefex.ru/wix?keyword=ducati+monster+workshop+manual` suggests a lure related to a workshop manual to attract clicks. ClamAV also detected this as Pdf.Phishing.Trojan, reinforcing the malicious intent. No scripts were extracted, but the overall structure and URL suggest a phishing or SEO manipulation tactic.

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://vilenefex.ru/wix?keyword=ducati+monster+workshop+manual
    • https://cdn-cms.f-static.net/uploads/4369923/normal_603130979e345.pdf
    • https://cdn-cms.f-static.net/uploads/4446152/normal_600f17d01eb07.pdf
    • https://cdn-cms.f-static.net/uploads/4408866/normal_600cb4192d1b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_9215172a5f424222a10922a8618c849f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d1bebd60-bf4e-4ba2-86ac-99b8178dee87/7251514806.pdf
    • https://s3.amazonaws.com/jeponowon/codashop_pro_apk_mod.pdf
    • https://uploads.strikinglycdn.com/files/e6c47cd8-3788-4121-965b-e350f971cfbb/dilizowikiwazinilu.pdf
    • https://s3.amazonaws.com/vokeri/8599003554.pdf
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_cfd175da55b445788e52883817ef3a96.pdf?index=true
    • https://s3.amazonaws.com/vapelurowar/tiresal.pdf
    • https://s3.amazonaws.com/salade/islamic_belief_system_shomali.pdf
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_3033d491ad604f66aca16f0c955084da.pdf?index=true
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_6de169d50f2443858f8bf5735d9709a7.pdf?index=true
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_1ee6548e3584450e9b4454b99d04000f.pdf?index=true
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_b9f80801fbf1496aacfc07719b3a3ff3.pdf?index=true
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_9ac8d75706414415aba4f30bd165d06f.pdf?index=true
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_7a25c0efb0404364bdfc132ec8e667cb.pdf?index=true
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_fd6eb00f38df43478712c1a668934e9d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94ad26b3-0c61-4507-8fba-d56c14e976fd/serato_dj_lite_1.0.5_free_download.pdf
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_9109b5d12811440e98b78bf4b75c0b2a.pdf?index=true
    • https://s3.amazonaws.com/kubafezin/bulk_density_determination.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_off000106a2.bin
66acfb78aba0643e7007e49d35078120e3e8f67e28795bd821865f28d976483a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 5328 bytes
font_01_sfnt_off000118b2.bin
0202eb98117dc9f44bf2424122a6d90584d6e6ce7b00a3c052f89f924ded84fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 11352 bytes

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