Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bf4692492aca9b…

MALICIOUS

PDF

66.9 KB Created: 2021-03-28 10:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 839acf4f645e9b007f4a1b1530030de3 SHA-1: 907ad94e7f69eb04a58c1f67e1495998b37ef20d SHA-256: c5bf4692492aca9b47682b72280fe08923ec0e5a712f56588937177b9f24b585
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=tenths+and+hundredths+grid+worksheets PDF link annotation
    • https://cdn.sqhk.co/womawuxinuge/xif5lgj/32903544212.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/bChjicz/67383696028.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/hLMjdxa/drifted_stunt_cars_3.pdfIn PDF document text
    • http://youtube-subscribes.com/mcgraw_hill_answer_key_grade_7sks5i.pdfIn PDF document text
    • https://cdn.sqhk.co/xatuxazaz/7jfhhgh/gipofoluso.pdfIn PDF document text
    • http://muldwych.com/ixl_learningsearch_topics_and_skills_username_password_remember3klp3.pdfIn PDF document text
    • http://on-arenas.com/zaxadefivu544cr.pdfIn PDF document text
    • http://jilet2.club/basics_of_digital_communicationcu1t7.pdfIn PDF document text
    • http://robertferrell.net/23742584556596i2.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/ikIf2hh/32491924581.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/29701485806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908862de-ab3a-44d8-bc3a-1b7d8140a6d9/kuledetadonosigutikawijez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5bd2f4f-4e8a-4114-a452-8bea177dca5f/13658110762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f42b4527-c1fb-4fb1-9ef8-ba8dee0d3a05/best_how_to_draw_books_for_7_year_olds.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/what_is_the_true_meaning_of_psalm_23.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/bumomuwokitepume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad7efae-f911-40c0-b293-bc11e5c8fddb/82299964.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/auburn_basketball_uniforms_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc82aea-e1df-49eb-9b63-15c3e2d54dc6/tp-link_tl-mr3020_manual_en_franais.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93D 5160 bytes
SHA-256: fe1aae3bf1e8c998daf95b1518960c31164d13b7198b3d7c78f51bcca3aa2776
font_01_sfnt_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 10512 bytes
SHA-256: ff8ecbee8b8c0a9170aeaa8ffd8bb9b22fdef04127110a76edbfb6b10ece21f8

Open this report in the interactive analyzer, or submit your own file for analysis.