Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24792d4c6e6e508…

MALICIOUS

PDF

79.0 KB Created: 2021-03-31 21:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c74cfedc19d186e440a4f515e708d20e SHA-1: 775ee72fa62b76eac82989bce019ad394ddf03d6 SHA-256: c24792d4c6e6e508f451ae13708262fd7226583ae12e9c6688fdd52375d19914
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristic firings suggest it functions as a link farm, containing numerous external URLs, with one primary URL being https://dafemum.ru/123?utm_term=goal+setting+template+for+college+students. While no scripts were explicitly extracted, the PDF structure and the presence of many external links point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=goal+setting+template+for+college+students
    • https://cdn.sqhk.co/naludibeg/BNhbTHs/talk_to_strangers_video_call_online_free.pdf
    • https://cdn.sqhk.co/ninevowa/3Prugcu/wpf_datagridtemplatecolumn_celleditending.pdf
    • https://cdn.sqhk.co/tugadeboda/pWhj5ig/screen_time_app_limits_android.pdf
    • https://cdn.sqhk.co/bavimimo/jztyUhh/71319034841.pdf
    • https://cdn.sqhk.co/tupuvebafo/h05hfha/bam_bam_bole_song_by_leo.pdf
    • https://cdn.sqhk.co/xubewarow/dBSXhhT/minecraft_skin_king_crimson.pdf
    • https://cdn.sqhk.co/safubuguva/jLgifNc/4816201744.pdf
    • https://cdn.sqhk.co/wuvotalek/jgjhghk/toyota_prius_electrical_wiring_diagram.pdf
    • https://static.s123-cdn-static.com/uploads/4386837/normal_6004fe40759d2.pdf
    • https://cdn-cms.f-static.net/uploads/4464323/normal_600f51dc36cdc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/38a3a40e-ccd4-49a8-a569-381b60cf6af4/what_products_are_made_in_north_america.pdf
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_cd4d7646c78f4430aedd8ef9a2c4e103.pdf?index=true
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_a485803c61d7467e9876d44edb89a756.pdf?index=true
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_8ffad14661fe4e6aa0f6cfec1a677e01.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b99f2b93-380e-48af-a523-02698a4ccf60/nakonawigulunaxobafes.pdf
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_4b0be14f15774d2895bd0a8110c1b64d.pdf?index=true
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_b040807982ad47c894329cd9bf71e80c.pdf?index=true
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_37661b0816454b6492e10ccdbd4fe2dc.pdf?index=true
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_2f944315a1ac4f6e92720a9e61a6f35a.pdf?index=true
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_1c5a8a03d55b4aa19a29c44b2a99a95c.pdf?index=true
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_2b9519ae1e0b41e28dd2317daf727d9d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d0.bin
6511923078c28ed7f636b7577e49e51c774bdfe1dfe5e78b6732da0fc721b6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 5508 bytes
font_01_sfnt_off00010673.bin
8eb75aed3574081c01a6ca4f3047a8634a430e5cecbc9ab67b0d234388d1a0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 11112 bytes

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