Malicious PDF — malware analysis report

Static analysis result for SHA-256 17356cd8be443e9b…

MALICIOUS

PDF

72.1 KB Created: 2021-04-05 01:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7ee1c99c23703ded5c412fadd69155e7 SHA-1: 6c332c069f48e129d1c2421b22959ef4330b25ad SHA-256: 17356cd8be443e9b283f1e5d2277d6973a693f50cf4263838942f9e5891a26b1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to external URLs such as https://mezovuduw.ru/award?keyword=buku+belajar+membaca+tk+pdf. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to disguise a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/award?keyword=buku+belajar+membaca+tk+pdf PDF link annotation
    • http://zolidunepojew.iblogger.org/bexusowuparamewadobuvuxex.pdfIn PDF document text
    • http://dawavuwera.22web.org/comment_ecrire_une_biographie.pdfIn PDF document text
    • http://naverako.iblogger.org/ruvoki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_4f4f170aa5ed4f879f894e3915af0e30.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_40dcf6267c3844d88a9a1f08d4775baf.pdf?index=trueIn PDF document text
    • http://sapeduz.epizy.com/sesenuzud.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_b00a0c61ddfe48c4877cc12fc86ed01b.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_646174b6af0b43a288369a05ea6a1928.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_cef12ec26f3e41ca9a728eeadf785da9.pdf?index=trueIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_0fc61a07d33f4c7da4b1d836c224cd93.pdf?index=trueIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_4ee173ed2a634de7bdbcae2a1befa68b.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_8dfaeae7ce9f4c1bb23f46c8cbfb8264.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_74f3ed90225f4d3aa62605cd94a4a9d9.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_2edd7d6b2b5d482291f607134fb9e262.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f57daa-c16d-4cf1-9f4f-9362262ed084/guitar_chord_progressions.pdfIn PDF document text
    • http://fawibamawepud.rf.gd/98206955808.pdfIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_b66c065111f24e759ec3ea19556ab80e.pdf?index=trueIn PDF document text
    • http://benesaputezoxo.rf.gd/guvijasu.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_6b390f8c3eb845da9a07eb6b4812c571.pdf?index=trueIn PDF document text
    • http://dejoruxebesinem.rf.gd/create_letterhead_template_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eae6911-a1fa-42f5-ad6c-e3c5e8239640/majaliripebamafoti.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_265553e38a464c01910a224af19143db.pdf?index=trueIn PDF document text
    • http://fexinitakemalu.epizy.com/battle_house_hd_movie.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 5452 bytes
SHA-256: e599269e745d534de00b338deddc8413bada68142e381baf7077c0720f901460
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 10448 bytes
SHA-256: 9064c3b207531f7e96a8b746600cd75e910adb34433852b70a82ee4f23936186

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