Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d5ede8934f3e74…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 22:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e81614ffdd026f183272347208d4cd5 SHA-1: 9e833a3b38dce7823fde5c372ce825fd471b5787 SHA-256: 08d5ede8934f3e74e72ace9e779114f4306bae603e64b93d548a1994f5772d0e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one specifically pointing to a URL that appears to be part of a link farm designed to mimic search results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest an attempt to redirect the user to malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=domain+name+system+pdf
    • https://static.s123-cdn-static.com/uploads/4369760/normal_5ff34d63b5079.pdf
    • https://cdn-cms.f-static.net/uploads/4501998/normal_603e4104779e3.pdf
    • https://tagipuzato.weebly.com/uploads/1/3/0/7/130776724/ridanirefukawi_tipenovirituvu_mudovuzizebe.pdf
    • https://mogimefiledewe.weebly.com/uploads/1/3/1/8/131857364/7637615.pdf
    • https://xufiridib.weebly.com/uploads/1/3/5/3/135346556/5904214.pdf
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/b091968.pdf
    • https://cdn-cms.f-static.net/uploads/4415937/normal_60214549776fb.pdf
    • https://static.s123-cdn-static.com/uploads/4417990/normal_6001934201e5d.pdf
    • https://kidogotetivi.weebly.com/uploads/1/3/4/3/134375399/9621720.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mexijegedakol/six_pack_abs_workout_at_home.pdf
    • https://uploads.strikinglycdn.com/files/131fcc95-b508-45e8-884a-79bec471c1c5/7618493751.pdf
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_6f9192043eac4d8796606e353cbcc0fe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/31c857e7-7e57-43a9-8714-ff8429c57b46/zukemel.pdf
    • https://s3.amazonaws.com/dotivaf/ventajas_del_almacenamiento_en_la_nube.pdf
    • https://uploads.strikinglycdn.com/files/c3d1721b-3612-4065-8fdd-4cf114c7216a/dogijemijotuzezajexakerek.pdf
    • https://s3.amazonaws.com/xasovewipeje/formica_sheets_black.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/is_there_a_season_2_of_war_of_the_worlds_on_sbs.pdf
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_a380e06787c94a94930a3c6d3c982d10.pdf?index=true
    • https://s3.amazonaws.com/jukezeluf/the_mysterious_benedict_society_movie_dream_cast.pdf
    • https://s3.amazonaws.com/midaguvimabof/lowov.pdf
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_25987005f68841ecab8136927b248671.pdf?index=true
    • https://s3.amazonaws.com/gatazeromij/the_bodhisattva_path.pdf
    • https://uploads.strikinglycdn.com/files/31a237d0-add1-4858-b39c-a69044eb31a8/98894223754.pdf
    • https://uploads.strikinglycdn.com/files/08d569f9-f956-447d-9af6-5e7e31d7b587/19870073476.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_off0000f14a.bin
a9860cedbc9c377856ad7536bc7340cc7838a30156d7c3e36cac8ffdcea1668d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 5160 bytes
font_01_sfnt_off000102d6.bin
aee74a474c997ddf490b82e7bb12853152de0e2f4ba066ee17b337edb781ce48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 11328 bytes

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