Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e780bdf5a7582c5…

MALICIOUS

PDF

93.5 KB Created: 2021-05-10 22:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a6ced0ef10c53bddb126b59f126ca628 SHA-1: 00d420fe5ed47ccac011252adc34b0afe03830b0 SHA-256: 4e780bdf5a7582c5577ece560b80cb84827ae1dd1b7bf0840fda5d18cd4d61c4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily corrupted, appears to be a technical query, likely a lure to disguise the malicious intent of redirecting users to the external URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=what+is+the+difference+between+an+n-type+and+a+p-type+extrinsic+semiconductor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371799/normal_60598da600ad9.pdfIn PDF document text
    • https://cdn.sqhk.co/degawatoze/Bck1gds/space_shooter_gift_code_september_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/ghfUgcw/nhl_hockey_standings_stanley_cup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380543/normal_6008416942f76.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/BhgCpj1/fruit_cutter_walmart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422909/normal_5ff607af0452d.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/gBy8ijZ/steam_inventory_value_dota.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://navibav.epizy.com/97118593760.pdfIn PDF document text
    • http://kubusefot.epizy.com/mivejivip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/062aaf48-6e24-494b-8039-006d1c531bb3/sat_test_october_2017_usa_answers.pdfIn PDF document text
    • http://tidukalimipeba.epizy.com/how_to_change_transmission_fluid_honda_accord_2012.pdfIn PDF document text
    • http://gusabonatixuk.rf.gd/13963292269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390ce939-0f40-4f62-b2f5-c88d6da28699/how_to_use_excel_to_plot_line_graph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc202676-610c-406b-b052-ab90759da2d2/what_is_the_meaning_of_surah_mulk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb5f4aa-4082-4b0f-93e2-124edb3cc511/using_samsung_hmx-f90_as_webcam.pdfIn PDF document text
    • http://tumibemunozi.rf.gd/valetuvafasuzupajemep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89be20a6-ccdb-4b26-95e0-d2eb717e6bd4/developmental_psychology_subtopics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2662be8-41f0-41f6-a31e-08eacae2c232/are_spotted_lanternflies_toxic_to_dogs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6419b01-899f-486e-9aca-b772d96631ca/nordictrack_audiostrider_800_console_not_working.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_off000120b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B7 5692 bytes
SHA-256: 13e5aab4b56f25c946d3cab7ce82e91fac8c2dda266dc68333a203105c85bde0
font_01_sfnt_off00013402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13402 11100 bytes
SHA-256: e2bc47c058aadbcfb37c0df0472abeb0208bac07d2df33b52659267ea1ec80d5
font_02_sfnt_off00015a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A03 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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