Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d049623b3810760…

MALICIOUS

PDF

72.7 KB Created: 2021-03-19 13:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 626715f7a4a04f4d4b80c9880b6833a9 SHA-1: ddbb4e37415ee2b6600f6fa06a56d6808adae085 SHA-256: 5d049623b381076058dd16b861503bf17aeb39bd80226269553644ed996e9245
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a ClamAV signature, specifically flagging it as a phishing trojan. It contains numerous external links, indicating a likely attempt to redirect users to malicious websites for further exploitation or phishing. The PDF structure and embedded links suggest a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/wix?keyword=absolute+value+functions+worksheet+doc
    • https://susuwiwonilo.weebly.com/uploads/1/3/1/6/131606006/tuzetosabup.pdf
    • http://fisidunetozusi.iblogger.org/konazavomaj.pdf
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/baa3f3a0.pdf
    • https://resusogid.weebly.com/uploads/1/3/5/3/135346187/7674743.pdf
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fe5d650ba13d.pdf
    • https://cdn.sqhk.co/kinanekoxo/TjgxhgS/apple_music_app_on_mac.pdf
    • https://cdn.sqhk.co/wixexozesila/djdjfhe/1532964127.pdf
    • https://static.s123-cdn-static.com/uploads/4389353/normal_5fd048415fb4c.pdf
    • http://mipasotul.22web.org/ps4_controller_not_working_unless_plugged_in.pdf
    • http://kixubobumetorab.iblogger.org/vshare_free_ios_5._1._1.pdf
    • https://static.s123-cdn-static.com/uploads/4426558/normal_5ff0612ab4c8d.pdf
    • https://cdn-cms.f-static.net/uploads/4389074/normal_602400eb262c4.pdf
    • https://cdn.sqhk.co/kimefutif/MjeiWie/monster_run_movie_wiki.pdf
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5fc880807d80e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_b3cca8491817436885d407e999b50e52.pdf?index=true
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_152613b56cf94b1b8c7a85421741c0a8.pdf?index=true
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_3924385e88ea4778abe8ddaa1935a9d4.pdf?index=true
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_3fd2d5b524824c4cb39011646f0a9fba.pdf?index=true
    • http://jiporiri.rf.gd/38212966697.pdf
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_f6270e970dea4d5ca6da061c620d0af6.pdf?index=true
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_aeb3902b5c3340a3a449075ef7a895a5.pdf?index=true
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_49a1235899204affa6c447ad261c4ce5.pdf?index=true
    • http://boreduse.rf.gd/hitron_cgn_review.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_off0000def6.bin
73c18c1e222b329bd9fec1e30cbb551dc680196416f9f327cc3ee7e33d05d6cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 5456 bytes
font_01_sfnt_off0000f192.bin
8c9bef22fa314e052c90ce9f947db8470a6774fd3e4f4e996d5bc26ac7c32950		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 10432 bytes

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