Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e7a063ce66a632…

MALICIOUS

PDF

79.8 KB Created: 2021-06-13 07:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 13ac5c3045257c742acfb4d8d85f2ded SHA-1: a88f1162cc233107a323096ba4c4ed4d12ab96cf SHA-256: d6e7a063ce66a6322b9b3d867d59d55179813e732b28d7fd231600f6d55f5ccc
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URL points to a suspicious domain, likely serving as a lure for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to redirect the user to malicious 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
  • 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://ketchas.ru/pbw?utm_term=dry+land+swimming+exercises PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472486/normal_5fe1bbc1aa6e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482020/normal_6001a9b4017ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_606ca45121bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498376/normal_60b90df331b8f.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
    • https://uploads.strikinglycdn.com/files/2b5e39c9-2049-44ee-af73-e1a394270b8d/sinibefelujuvimam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6125ba-8d32-4461-adb1-5a5e82c6af60/que_es_artesanal.pdfIn PDF document text
    • http://vojewukejiwu.pbworks.com/w/file/fetch/145021029/instagram_stalker_premium_apk.pdfIn PDF document text
    • http://niluputevi.pbworks.com/f/50286400161.pdfIn PDF document text
    • http://biwonuv.pbworks.com/f/free_download_java_jdk_1.7_0_for_windows_7_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1716362a-3e68-43b3-92d8-a76f38880012/how_to_make_a_boarding_pass_invitation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca479877-4cf5-4e56-a843-352c17e554f5/vaberanububen.pdfIn PDF document text
    • http://wevapejatu.pbworks.com/w/file/fetch/144787047/owensboro_messenger_inquirer_e_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a10efaf-5d8c-46f8-a78a-7fdfbd1ca5e4/best_budget_tws_earbuds_2019_india.pdfIn PDF document text
    • http://povelin.pbworks.com/f/equation_calculator_apk.pdfIn PDF document text
    • http://zuxanoguk.pbworks.com/f/bisojirepajobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b793ae3-1d02-46f1-80c7-ccb35e1fc9cf/guguxuxebomukuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81f0550-b246-48eb-a91d-b014fdd9f4a5/35577107862.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144426183/38601462556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83bd5b24-77ed-4923-97cb-192bb91c1d2c/mudojetux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b578c8f7-0d16-4432-8f56-5c4035b153d4/what_is_blood_oath_all_about.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_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 5116 bytes
SHA-256: 1f1cb1e274c6b6307a529256077295b2ef23d7ade0879c886553cbbce940a62b
font_01_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 10780 bytes
SHA-256: c094417cf3616f115987e61971b3b62be7fdb53d3cf4e1a13e4abe29cdd4417d
font_02_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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