Malicious PDF — malware analysis report

Static analysis result for SHA-256 a141658a94a3393e…

MALICIOUS

PDF

77.8 KB Created: 2021-04-03 12:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9fd09595761d13af737bd64af8d11cac SHA-1: 191867f391fc37afc02b2541a0d9cf1db79e09ee SHA-256: a141658a94a3393efda00e76f33b7629a2ed4d87580d68ed2be19188dd03cf9e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded links, many of which lead to disposable hosting or known malicious redirectors, indicating an attempt to direct users to harmful content. No scripts were extracted, and the document body was heavily obfuscated and truncated, preventing further analysis of its specific content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=major+expenditures+note+taking+guide+food In PDF document text
    • http://tozepefaj.iblogger.org/wurikes.pdfIn PDF document text
    • http://mubositesene.mypressonline.com/wumagabox.pdfIn PDF document text
    • http://thecabinets.xyz/bepiludanetejonowedok56vp.pdfIn PDF document text
    • http://sakekoduside.iblogger.org/bonisarunivajatepipo.pdfIn PDF document text
    • http://disetikala.22web.org/50000057750.pdfIn PDF document text
    • http://crystal-light33.ru/8721659266nkptu.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/zoniwajuzavolarirewewixu.pdfIn PDF document text
    • http://zigapajuxijado.mywebcommunity.org/tetasuwasekokesekogi.pdfIn PDF document text
    • http://gidepel.22web.org/film_ajari_aku_islam_sub_indo.pdfIn PDF document text
    • http://dabipijejunale.22web.org/4745254970.pdfIn PDF document text
    • http://nonoxutiwi.mypressonline.com/ganesh_atharvashirsha_download.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/75651937813wq82d.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/how_much_does_the_news_break_app_costgdxxt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://najudugofuk.rf.gd/the_odin_crispr_guide.pdfIn PDF document text
    • http://wofenexofube.rf.gd/behavior_management_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b5fb84-d22c-46e5-b381-f715e3432a17/ultimate_mortal_kombat_3_sega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe9ff6d-c82e-454a-8830-785cd52c28ab/lagagulezones.pdfIn PDF document text
    • http://xumizimewimapa.epizy.com/pdf_to_word_text_editor_online.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 5272 bytes
SHA-256: 9e0ef9d3aedbb373b04539c909886ff1f5b6c4f1ea796326fb2d488266082942
font_01_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 10448 bytes
SHA-256: c1c1409e2191ddea397979e7460735670f09e02a5bc038e6ec016d3be268d57c
font_02_sfnt_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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