Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b89d45cd8de07d…

MALICIOUS

PDF

90.0 KB Created: 2021-04-08 00:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c581c16fbff38b99da3afd37a4d7369a SHA-1: d331389b094db7191ee972218737f032574ac91b SHA-256: e5b89d45cd8de07dba99fded3bd322d83da8e5d35b8c8575f501ccab3ac985b4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, characteristic of a link farm designed to improve search engine rankings for specific keywords. The primary URL suggests a lure related to finding a specific PDF online. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zajinet.ru/wix?keyword=calculus+early+transcendentals+8th+edition+pdf+online+reddit
    • https://cdn.sqhk.co/marixefe/6iiGjj0/slytherin_robe_costume_girl.pdf
    • https://nefagowilad.weebly.com/uploads/1/3/4/7/134742945/e268fb.pdf
    • https://cdn.sqhk.co/zudatona/RjgvEPr/13129226734.pdf
    • https://static.s123-cdn-static.com/uploads/4451549/normal_6005a16f31393.pdf
    • https://jazejuvo.weebly.com/uploads/1/3/4/4/134439384/zuliv.pdf
    • https://warororob.weebly.com/uploads/1/3/5/3/135314520/sixaroviwiwugizuvot.pdf
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fd08e30f01fd.pdf
    • https://cdn-cms.f-static.net/uploads/4446029/normal_6062f5510af8a.pdf
    • https://cdn.sqhk.co/vedoreket/p3RTG7t/theeratha_vilayattu_pillai_song_lyrics.pdf
    • https://cdn.sqhk.co/xuxiropuwomo/AbjahcX/50832089783.pdf
    • https://cdn.sqhk.co/wumigapinido/giBMhjj/lyrics_video_app_download.pdf
    • https://cdn-cms.f-static.net/uploads/4456143/normal_601bc11e72d4f.pdf
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/damipup.pdf
    • https://cdn.sqhk.co/vunebapenuj/jjiehCT/piano_tiles_3_game_free_download.pdf
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/cbf50da.pdf
    • https://cdn.sqhk.co/balaragu/Hic5Uhj/84482173092.pdf
    • https://cdn.sqhk.co/womafafowix/PrGwhhh/door_closer_installation.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_90efb92b60c14aec913c8c589451c825.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3e747028-c154-483f-9ea8-ff9349cb1de6/shark_rotator_powered_lift_away_with_duoclean_reviews.pdf
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_cc5bfc578d0d4dcd90bfb4d5c0c9f9db.pdf?index=true
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_b56d0e4aae2a467bb1710ecc4c5454ba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7a85318f-4713-4791-b1c3-1f0048239fd0/alesis_dm10_repair.pdf
    • https://dd3a609d-fcd9-461e-ae06-f7e9ec6f332d.filesusr.com/ugd/811c3f_452053cac4fd4538a88765f755fc17a4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0aedfac2-7f0c-4b5d-8894-4a2175764b82/trail_tech_vapor_rpm_install.pdf
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_fd02bed7e1ee400cb35b72c3b1471d25.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_off0001126c.bin
e997445ea3c9d4c1aea9eaa7ecc9c36b2aefd15c575df605de8454dd37b809e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 5444 bytes
font_01_sfnt_off000124ea.bin
f8ff90c887fbd9a7440384d8f95ea37b1caad134b2d09c17b3225c628f9dfc92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 11440 bytes
font_02_sfnt_off00014bfc.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFC 4324 bytes

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