Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1420d67febb412…

MALICIOUS

PDF

78.7 KB Created: 2021-03-31 03:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eab6fc65ad36c69ad4e38bdf8ff1e4a0 SHA-1: 78ddaa0b6bc3ce35685315a992371d0c69b3eeaf SHA-256: 8b1420d67febb41231e397277a91aaa15c95b2024db337b6e5eff13f7516e0f2
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially malicious websites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/123?utm_term=possessive+form+of+business+ap+style
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/5ef48322182c.pdf
    • https://rodagekutav.weebly.com/uploads/1/3/5/3/135313742/3432631.pdf
    • http://wigisosidika.22web.org/burger_king_menu_5_for_4_dollars.pdf
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/6c1be1ce7121.pdf
    • https://palelajasirele.weebly.com/uploads/1/3/5/3/135311742/7fab2cb7e.pdf
    • http://kedejusofapirej.22web.org/67132934696.pdf
    • http://bubuwem.iblogger.org/human_trafficking_in_the_united_states_2018_statistics.pdf
    • http://vepozatab.22web.org/actuate_birt_information_designer.pdf
    • https://tavadarikozo.weebly.com/uploads/1/3/5/9/135987174/3195707.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suvoxezol.rf.gd/16223095662.pdf
    • https://uploads.strikinglycdn.com/files/95cebc91-395e-4731-8b84-4b3c2a048261/dunkin_donuts_caramel_latte_nutrition_facts.pdf
    • http://fagorawed.rf.gd/simple_professional_presentation_template.pdf
    • https://s3.amazonaws.com/legobegutulo/5_and_2_diet_success_stories.pdf
    • http://didajuna.rf.gd/49665976186.pdf
    • https://s3.amazonaws.com/xulepiwa/pexisogiverejadituno.pdf
    • http://jagesaba.epizy.com/kokigagosotufesige.pdf
    • https://s3.amazonaws.com/fejenijovekozu/jaguars_injury_report_week_8.pdf
    • https://uploads.strikinglycdn.com/files/dc8c5076-baee-4c6b-8eaa-d046c38cbd22/wiromidivanedefavesow.pdf
    • https://uploads.strikinglycdn.com/files/b0e5ee0d-e65b-4e01-b80b-1b7afdb5e6f0/28327332373.pdf
    • http://rixibebesimi.epizy.com/thermo_king_md_200_parts_diagram.pdf
    • https://uploads.strikinglycdn.com/files/b707cbd2-5ca9-476c-b40a-703756e16eca/rosemarys_baby_1968_streaming_vostfr.pdf
    • http://tuzibepunu.rf.gd/ps_vita_emulator_android_apk_download.pdf
    • http://pimizebogo.rf.gd/ditty_crossword_answer.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_off0000f31c.bin
573be4a7d30f5572b1695e8ac675f4ce93e1a379bd75205e4c9916401e8f4fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 5352 bytes
font_01_sfnt_off00010542.bin
ca803aff5d440b50b1aa19f453bace4fe562f94fe81f195cf66284033262a8eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 11064 bytes

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