Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e8f12922cec3b8…

MALICIOUS

PDF

76.8 KB Created: 2021-04-30 14:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c255056ca2bdf76e5ed141409804a9f4 SHA-1: 12bc8f1b219733d4d82204c75ea0b98617a432ea SHA-256: c1e8f12922cec3b8de36ec9402c9b85d995da30a3c3c01a50d75d5ad007fbf71
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary one being `https://pelibifir.ru/strik?utm_term=free+willy+cast+2`, suggesting it's used to redirect users to potentially harmful content. The presence of many links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/strik?utm_term=free+willy+cast+2
    • http://ladebizelase.scienceontheweb.net/55512144690.pdf
    • http://4kuhd.me/pocket_icuqzbet.pdf
    • http://vodabutopidaru.getenjoyment.net/delelejojesuxadatatesu.pdf
    • http://jushq.pro/zibenimusixejumozapedagaku9lx.pdf
    • http://pixxel.life/general_mathematics_textbook_grade_1107ysi.pdf
    • http://pigalimiru.medianewsonline.com/albert_camus_plague.pdf
    • http://ninijefaligogi.mygamesonline.org/33825058633.pdf
    • http://naturwows.space/69576861697ixnuo.pdf
    • http://zumewidife.mygamesonline.org/84988124183.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wupagivoz/gekoda.pdf
    • http://xijizofupe.rf.gd/antibiogram_interpretation.pdf
    • https://uploads.strikinglycdn.com/files/83b5eb80-f5fe-43ef-abd8-2e8b1f2f913a/27117746022.pdf
    • https://uploads.strikinglycdn.com/files/36d1815e-e425-4e6b-9b36-51a1588a9f3f/does_sea_water_contains_magnesium.pdf
    • http://xemigososefof.atwebpages.com/46863938548.pdf
    • http://kubomefewofumim.atwebpages.com/adjectives_and_prepositions_list.pdf
    • http://dewonatazuji.epizy.com/work_in_the_21st_century_4th_edition.pdf
    • https://s3.amazonaws.com/minaxigevani/sat_test_prep_near_me.pdf
    • http://vezexosewomex.epizy.com/88549079006.pdf
    • https://s3.amazonaws.com/gagagakigibapo/intro_to_psychology_nyu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e474.bin
87ca10386d615755ea759307b272d7e2d3b1496993bbf0fa4c27ee5087235d02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 4648 bytes
font_01_sfnt_off0000f45d.bin
ff4d0e2acd054386a97645e48fdb4362c204b305bf4fa11c050adcea4d6edfbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 10172 bytes
font_02_sfnt_off000116e6.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 4324 bytes

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