Malicious PDF — malware analysis report

Static analysis result for SHA-256 1198d31b30f6480f…

MALICIOUS

PDF

86.3 KB Created: 2021-03-20 00:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bc4ae4e460d3aa495abde902d64b30d SHA-1: bc5a8eb1fbe9d795b9ae1e8c6f940410fb641674 SHA-256: 1198d31b30f6480fae4afb2c4417154f4d4f8b6e83c47b46670633a40a83bae3
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically noted as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content. Although no scripts were explicitly extracted, the presence of numerous URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/123?utm_term=equivalent+fractions+worksheet+free+pdf
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/lomidem.pdf
    • http://mixezitubut.mygamesonline.org/faminapesere.pdf
    • https://seboneluwisog.weebly.com/uploads/1/3/4/3/134368334/1518668.pdf
    • http://xemokajoled.medianewsonline.com/fodetuluz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lapefub.epizy.com/76999447002.pdf
    • https://s3.amazonaws.com/jarirotexab/krav_maga_tips_for_beginners.pdf
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_bedefd48fbd0411ca16ef57385bb3f17.pdf?index=true
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_2b40fa9fd7d14db2bd988abb557589e8.pdf?index=true
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_e1ba3df7da8342fa80dd2f6399dd2d69.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d4097350-03a4-475d-8d26-62151f4d5b38/vasipapefunasilesawu.pdf
    • https://s3.amazonaws.com/fakuguvil/golf_swing_video.pdf
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_70447d62812f48fea91d0d06dff51c55.pdf?index=true
    • https://uploads.strikinglycdn.com/files/583c17e5-8b4b-4195-b04a-cfbc5e815d04/81761201053.pdf
    • https://s3.amazonaws.com/jeromisixinolib/1236133901.pdf
    • https://uploads.strikinglycdn.com/files/d8a2ef86-9e1a-4c5a-a012-d949f084a7fe/total_gym_direct_coupon_code.pdf
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_49e3730540064451b85712999dead627.pdf?index=true
    • http://xubixetumed.rf.gd/archero_hack_money_apk.pdf
    • http://kutezowifemiwe.epizy.com/angular_reactive_form_onsubmit.pdf
    • https://uploads.strikinglycdn.com/files/4b7fe679-284d-49fd-a031-ab200146d157/obamacare_bill_signing.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_off0000fb89.bin
6ac96e598462f218106b834bb3a0382aa58129b8935b69f89574cd9f9ac7e1f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 5540 bytes
font_01_sfnt_off00010e78.bin
cd1e6f38ba8662ecb2b033bbca1e2dd5383ff3f02295b60c509a18f33139d907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E78 10976 bytes
font_02_sfnt_off00013448.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13448 16204 bytes

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