Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02200a32e52b5cb…

MALICIOUS

PDF

78.4 KB Created: 2021-03-29 14:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f893f2f6acd7a81d6fc036781fd86c0e SHA-1: 729d89664165e5645ff7ab30a4584d72151e5194 SHA-256: a02200a32e52b5cb416935a697f3f0963db61a51d770fd2684e508d36128694e
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('pelibifir.ru') that is likely used for malicious redirection. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host many links on disposable hosting, further supporting a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=history+day+2020+rules
    • http://irbestate.ru/soft_white_led_christmas_tree_lightsmsd7c.pdf
    • https://cdn.sqhk.co/pevelefotuve/jg7idin/53913676276.pdf
    • http://kungfumalibu.com/backup_android_phone_to_dropboxs08mr.pdf
    • https://cdn-cms.f-static.net/uploads/4473656/normal_600e8eb6dd34f.pdf
    • https://cdn-cms.f-static.net/uploads/4485157/normal_5fd0ff8b6819a.pdf
    • https://cdn.sqhk.co/kagitenoru/Fjijdjg/58734697395.pdf
    • http://expressvpn.store/kubota_bx2200_reviewzefje.pdf
    • http://roskycnmx.com/jizogibuxadogulebatuaiffj.pdf
    • http://kvyovk.xyz/tipakemigufarasajijufc8r4j.pdf
    • https://static.s123-cdn-static.com/uploads/4416935/normal_5fddd154d1fe7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4e5e8c3a-6d1d-4f38-a5d0-87fd434376a8/558361293.pdf
    • http://kelopejawutan.rf.gd/a._i._artificial_intelligence_movie.pdf
    • https://uploads.strikinglycdn.com/files/9be1520d-6132-483d-a234-3d5e4ea37106/chicco_liteway_stroller_manual.pdf
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_1d99f6311da4497bbbd6932bfb0b3d99.pdf?index=true
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_4fdc457e248d430f8259c1c242b946a1.pdf?index=true
    • http://zuwosopawekaz.rf.gd/59552319999.pdf
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_4a8ec31aebe2473babc026edacb808b5.pdf?index=true
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_4825e167e4f944ac8656b744d8277d62.pdf?index=true
    • https://uploads.strikinglycdn.com/files/19acdd76-3790-468e-b18e-fb45eaeba6db/pathfinder_2e_monsters_by_cr.pdf
    • http://vewamekigobuzuw.epizy.com/screen_calibration_app_for_android_tablet.pdf
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_6320f56cfd6543c7a10ae508e9b9926f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f752.bin
ee19a3c5af75b34ac903bd07ecb6cc6ed7168dbd60ba11978d3332b77c419706		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 5156 bytes
font_01_sfnt_off000108e8.bin
2a14652b76d8c7166a215a004430fd9131123bd3f0caeee7ae55641780acb5cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10464 bytes

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