Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd2be4f4bec833f…

MALICIOUS

PDF

81.0 KB Created: 2021-03-15 04:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e28724aacfe4a982e4f13d97cc165d57 SHA-1: de5730fb7726b77b4fa94884cbb78edf293b2b95 SHA-256: 4bd2be4f4bec833f382cced5984195f936bf4642bec75a6a3a08af84087448ce
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 pointing to S3 buckets and CDNs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary URL likely being part of a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/wix?keyword=santa+maria+della+salute+laza+kostic+analiza+dela
    • https://cdn.sqhk.co/dufelogaruf/Jjg1hdk/rotten_to_the_core_meaning.pdf
    • https://static.s123-cdn-static.com/uploads/4445729/normal_5fe2c2591209b.pdf
    • https://cdn.sqhk.co/tiluzegata/ijBhdhJ/car_crash_near_me_last_week.pdf
    • https://cdn.sqhk.co/kososojog/Beiik04/70694635714.pdf
    • https://cdn.sqhk.co/guzufaseba/eibwljb/tamogixekokowej.pdf
    • https://cdn-cms.f-static.net/uploads/4377902/normal_6045b9aa3bec7.pdf
    • https://cdn-cms.f-static.net/uploads/4481509/normal_601784db7894b.pdf
    • https://cdn-cms.f-static.net/uploads/4381980/normal_601e608f40796.pdf
    • https://tomovomat.weebly.com/uploads/1/3/4/6/134617768/kujexefekagepugumir.pdf
    • https://jivafizet.weebly.com/uploads/1/3/4/7/134743279/a05bcfb.pdf
    • https://cdn-cms.f-static.net/uploads/4375197/normal_601a84c784d13.pdf
    • https://static.s123-cdn-static.com/uploads/4369329/normal_6004a3b3ccbf1.pdf
    • https://cdn.sqhk.co/tifapoxur/gchegg6/euro_train_simulator_2_app_download.pdf
    • https://cdn-cms.f-static.net/uploads/4481162/normal_603bb7c4ca442.pdf
    • https://cdn-cms.f-static.net/uploads/4387226/normal_603758e5cbbd0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xedewofuretujo/raymond_pallet_truck_error_codes.pdf
    • https://s3.amazonaws.com/lokijuronig/lapuwefizasidatibep.pdf
    • https://s3.amazonaws.com/wudibirewuduto/86095613595.pdf
    • https://s3.amazonaws.com/tobaziw/hdfc_life_click_2_wealth.pdf
    • https://s3.amazonaws.com/fusidejebi/12884391602.pdf
    • https://s3.amazonaws.com/retisovojor/xumegawapiwavevusopude.pdf
    • https://s3.amazonaws.com/tumuzu/gefakumunelutetot.pdf
    • https://s3.amazonaws.com/gezetega/little_red_riding_hood_movie_song.pdf
    • https://s3.amazonaws.com/tasufagijaremo/zuxivuza.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_off0000fd4c.bin
354067b05816bf1c5f197d0251bb4126d5a07e00c1fbd778715ac9394ad89778		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 5300 bytes
font_01_sfnt_off00010f46.bin
9b3e0a7a17e0e205a15639fa4bc4a84990e17127194ebea21d1994ec63bf9de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 11564 bytes

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