Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7113592b3e4aeb3…

MALICIOUS

PDF

85.9 KB Created: 2021-04-01 05:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 565f8b6aee30555eec05ddb99e115aba SHA-1: 4be93683d000971a5d92eed5a1235857739ce41c SHA-256: e7113592b3e4aeb3ea8cc6985f04b7dc2dc3a1b022967cdea77dc96b5a74f3b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also strongly indicate maliciousness. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or information harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/wix?keyword=rainsoft+water+softener+classic+apollo+manual
    • https://cdn.sqhk.co/duwokarewesu/jbqQleC/missing_my_hubby_memes.pdf
    • http://tezijexipilimo.getenjoyment.net/20219814886.pdf
    • https://cdn.sqhk.co/foropogajag/jjiihbt/80268628000.pdf
    • https://venozosuvizulul.weebly.com/uploads/1/3/0/8/130814909/vibijoxi_nubisomuzi.pdf
    • http://linodogeb.scienceontheweb.net/antimicrobial_therapy_book.pdf
    • https://zukigepuzena.weebly.com/uploads/1/3/4/5/134593101/221b3.pdf
    • https://cdn.sqhk.co/gijesali/jYigYp6/challenge_telugu_movie_video_songs_free.pdf
    • https://cdn.sqhk.co/parikozug/ghjRZVM/kickboxing_classes_kingston_ma.pdf
    • https://cdn.sqhk.co/xovikojux/dibifje/20225434921.pdf
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/boraneraronu-puraba-pewub.pdf
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/1358304.pdf
    • https://cdn.sqhk.co/nadetajagupe/jhWZ3ji/92849595483.pdf
    • http://wovuwukotuvoxi.mygamesonline.org/55097014499.pdf
    • https://cdn.sqhk.co/pabukerofo/j3hbBgc/carrier_hub_processing_request.pdf
    • https://guxedujigizos.weebly.com/uploads/1/3/4/7/134735137/soretomasezosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://38a589f5-619b-4230-bc7d-f88d9fc6dac5.filesusr.com/ugd/392051_8ab3485724fe42dab43b57368c253801.pdf?index=true
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_024e98c819dd4ce19ac5d131b47cc756.pdf?index=true
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_4cb9550418b642849623ababf22ddd00.pdf?index=true
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_4ccacc91a38e4a24baf4fc1647a8ffb0.pdf?index=true
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_f49b34d912814dab8e27edd28c30a8b9.pdf?index=true
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_1c6228cceb1f4a5187d273554c637d27.pdf?index=true
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_ff8248267ee24712bb6a8329cf4a5b5b.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001030f.bin
ae09af817fd0ba719fa912cefa3a460dae3943fcd9787fdd6334199f8f361ce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 5144 bytes
font_01_sfnt_off0001148b.bin
18454e7372bc0ce555181937da4678348b5fa13349b90abed895f11123005a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 10972 bytes
font_02_sfnt_off00013a11.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A11 4324 bytes

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