Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce85c21158f26731…

MALICIOUS

PDF

84.6 KB Created: 2021-03-20 01:28:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1173664f85da90f367a40ee6d7f55785 SHA-1: 5ed5d2387ebffda5b330b265dd147eb9295a0d0b SHA-256: ce85c21158f26731e05271d7e6de69d5ad16900d507b850f2de3e3e7551cada9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are structured to appear as search results, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points to an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=mr+bean+movies+list+free
    • http://zatutajijiti.getenjoyment.net/mesolilodebo.pdf
    • http://gunofixe.medianewsonline.com/5004420528.pdf
    • http://waliduv.mypressonline.com/48035376061.pdf
    • http://borejukeluteva.mygamesonline.org/what_are_the_lexile_levels_by_grade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/viromibukoleliw/mulawokoxefufako.pdf
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_69e8f9815d9d4a589363f1b1df331b88.pdf?index=true
    • http://kemesuxaw.myartsonline.com/nopurivegogenej.pdf
    • https://uploads.strikinglycdn.com/files/c3447eb8-98fc-4e10-a4a9-b2c907bddfbe/95838908133.pdf
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_3408f249ff66452b833409494a34497c.pdf?index=true
    • https://s3.amazonaws.com/selivuvumepaveb/chromeleon_software_user_guide.pdf
    • https://s3.amazonaws.com/bokexizometun/51848268996.pdf
    • https://67389751-14cc-4ed3-b660-7ef7239e4cc3.filesusr.com/ugd/bb5584_8a07f70498534cbf99645f89c7dc0e45.pdf?index=true
    • https://s3.amazonaws.com/fedufiporara/videxedomasenarisun.pdf
    • https://uploads.strikinglycdn.com/files/7ad628c7-fe4c-41a0-a45c-a3516ab5d28a/how_hard_is_the_ham_radio_exam.pdf
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_eb0cb99f01fa43df81af153bc1b228d6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/59d9025b-6a5e-40ae-8065-4b99a0b692cf/takopumekomumurogepa.pdf
    • https://s3.amazonaws.com/fadupazageraf/sufoguliz.pdf
    • https://s3.amazonaws.com/muxozuvalubi/types_of_functional_training_exercises.pdf
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_f155ee03ab9f4b0fba58abac2e4ba50f.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_off000100ce.bin
c65bde04afb91eeda94fa49162284eb115b2b1bf128dcd6fe3e6fefbd34bf7e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 4908 bytes
font_01_sfnt_off00011164.bin
742c678d10bebaa66a9a4fd0225b53143739924598b5577295d71a6b501e9fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 11064 bytes
font_02_sfnt_off0001373c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1373C 4324 bytes

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