Malicious PDF — malware analysis report

Static analysis result for SHA-256 3590972a99304c8c…

MALICIOUS

PDF

99.5 KB Created: 2021-03-30 13:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2769de654158607c56dafd307137130 SHA-1: 4b897fba003132551ec1274801ad55989dc784e2 SHA-256: 3590972a99304c8cc6919013265278b55e91d5edb78d6b33deb2107b90cf5e80
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' and another flagging it as a phishing trojan. The presence of a 'download button' heuristic further suggests a deceptive lure. While no scripts were directly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/award?keyword=aspekto+ng+pandiwa+worksheet+grade+6+pdf
    • http://itwomen.space/kolojixoxevavisoxojpl75.pdf
    • http://levelupguild.com/46092779537t2c6x.pdf
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5fef14c65eb65.pdf
    • https://cdn-cms.f-static.net/uploads/4413578/normal_60595cd18942d.pdf
    • https://cdn-cms.f-static.net/uploads/4490542/normal_60432894e6db7.pdf
    • http://stavki.link/waravofozenudopewpluh.pdf
    • https://static.s123-cdn-static.com/uploads/4366034/normal_5ff6b01196e76.pdf
    • http://natur-bio.space/luxipj5oez.pdf
    • https://cdn-cms.f-static.net/uploads/4380522/normal_605c92fa8885c.pdf
    • http://comp-arenda.site/xufasukekiwepoxojozk3y93.pdf
    • https://cdn-cms.f-static.net/uploads/4485942/normal_601aacd2f0222.pdf
    • https://cdn-cms.f-static.net/uploads/4481059/normal_603e9184d9c3e.pdf
    • https://static.s123-cdn-static.com/uploads/4501367/normal_6002a72e2f592.pdf
    • https://static.s123-cdn-static.com/uploads/4459028/normal_600152ff53c30.pdf
    • http://pubgmobiie.com/which_of_the_following_accounts_is_a_plant_asset6t7ul.pdf
    • http://svoylend.xyz/62325282113077us.pdf
    • https://cdn-cms.f-static.net/uploads/4464314/normal_601be8d22fa9e.pdf
    • https://static.s123-cdn-static.com/uploads/4464542/normal_6002e7c972cd4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_fa5fd1f6503f44038c74b368d2947ea9.pdf?index=true
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_360047280cb040ccaff793c47cdd43a1.pdf?index=true
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_138bd10c2afd4244b5d1f39f91119ad8.pdf?index=true
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_39a9fba3bd2d4ad49a220f984fddf571.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_off000137ce.bin
0c5ea3be9dd37d6a02b79a23ecc9a3a27bd2efab9f7701976169620ef92a5724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137CE 5356 bytes
font_01_sfnt_off00014a0d.bin
3ab74c9577d17ad4902c534e15286f71e988b45895dcf470c44fd93f443204ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0D 12220 bytes
font_02_sfnt_off0001726d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1726D 4324 bytes

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