Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1d349c9fc348a7…

MALICIOUS

PDF

82.1 KB Created: 2021-03-22 01:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f2f97b452d109160c4b491c93b375a14 SHA-1: 52e6d246414b0bc4a39c48950ce681cd6183e29a SHA-256: 4b1d349c9fc348a74368ed6d1dd322c027c7a73f6b044ef1571034ff71bfcc72
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/123?utm_term=answer+me+1997 PDF link annotation
    • http://vashe-zdorovie.xyz/95887920029w5j9r.pdfIn PDF document text
    • https://futafapegimato.weebly.com/uploads/1/3/1/8/131855997/remila.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/BgfCbGQ/hyperion_launcher_pro_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bezedono/hbXhj7K/escape_from_alcatraz_full_movie_free_online.pdfIn PDF document text
    • https://nalujedadi.weebly.com/uploads/1/3/4/5/134514722/fc547d.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/viciigi/baby_blue_room_colors.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/YgdSPha/icy_brick_breaker_arcade_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/jjgQtih/zowezo.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/hoihhgN/the_big_easy_alias_crossword_clue.pdfIn PDF document text
    • http://latencfsrt.space/nagususumadadedupqg43x.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/bZIvE0n/pezubijulukomazisilijex.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/ihgiggg/rumovujofeterobebapej.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/412eaf5b-d018-4dcb-88de-fca7bcbea88d/critical_race_theory_sbc_presidents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24576a46-873f-445f-a7e5-e608b4ba6db4/remington_sportsman_11-87_reviews.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/rowibimaxupusudijawalug.pdfIn PDF document text
    • http://zaxuzut.atwebpages.com/amliorer_mon_franais_communication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5c81eb-46fc-45ba-b3cb-adb99dd46fe8/12574254316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf46731-5b12-4f15-810d-34079607af08/728909173.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_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 4096 bytes
SHA-256: a42d180aff5339f43d68d45eccaf5c622b52a701e5c314c620c7162c3f0e246a
font_01_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 4956 bytes
SHA-256: 58e115846064d47f02539f9cef4bc13a379cb738beaf97d9c75fb17cf47a6195
font_02_sfnt_off0001111a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 12512 bytes
SHA-256: 6ebd4f829c6b47da150bd39c882fef451a84d1a95141779005b55510b0e2a08d

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