Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe064c8ea3d91ff…

MALICIOUS

PDF

77.9 KB Created: 2021-04-03 11:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8ed846a76f133135c975ebda3fcea510 SHA-1: 516d1d284024dcac3d083186b574852d13c71be4 SHA-256: fbe064c8ea3d91ffd55d6123ed089cb7ab70ead7395ff100fdc180a5629e98ff
184 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains numerous embedded URLs. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags links to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests the document is part of a link farm hosted on disposable infrastructure, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/award?keyword=diagnosis+anemia+defisiensi+besi+pdf In PDF document text
    • https://jegivobepumo.weebly.com/uploads/1/3/4/4/134444156/8150949.pdfIn PDF document text
    • http://matasojebare.iblogger.org/bncc_ensino_fundamental_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/4kJhjyU/team_deathmatch_4v4.pdfIn PDF document text
    • https://cdn.sqhk.co/zemujipuluwo/haihbfO/wugafilok.pdfIn PDF document text
    • https://sizugive.weebly.com/uploads/1/3/5/9/135993047/ninaxegila.pdfIn PDF document text
    • http://verunej.iblogger.org/zawenegovazusofaj.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/c8746cb3038b.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/AhdHO0X/father_and_son_barber_quotes.pdfIn PDF document text
    • http://puwobero.22web.org/mu_cv_n_gin.pdfIn PDF document text
    • https://cdn.sqhk.co/gidowoji/ruHGhaz/7583079783.pdfIn PDF document text
    • http://mirunex.iblogger.org/jupifebononij.pdfIn PDF document text
    • https://gawuwusirijer.weebly.com/uploads/1/3/4/1/134108670/5195534.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25abd45-2c3b-4a8d-90f2-6158b5111b6e/saveferarasibixodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7967c283-150e-4d79-8850-def7df058e02/wayne_dalton_garage_door_opener_reset_button.pdfIn PDF document text
    • http://nilevividik.rf.gd/np_antivirus_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/kawasaki_disease_guideline_2017.pdfIn PDF document text
    • http://nodezolejew.epizy.com/67784359311.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/enlightened_despots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c6f48e-0467-4d00-b81d-4fb4ac996a04/76525955198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf52e2e-dbff-4c25-aa3a-4a71bbdb509c/how_to_replace_lost_ebt_card_online.pdfIn PDF document text
    • http://fubolorira.epizy.com/dulafojutokepibav.pdfIn PDF document text
    • http://tubofebagadupa.epizy.com/flower_bouquet_images.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 5372 bytes
SHA-256: 212f23159c0ea9755c8b35e8dd2f250536dc2382d6dfb9c41bc41c7dd68f3f75
font_01_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 12172 bytes
SHA-256: 72b7af7d248e336f5f3d7ae0de4948f361ff8d5b4ff70aa249faf6211abae497

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