Malicious PDF — malware analysis report

Static analysis result for SHA-256 78575daf9c53f3a5…

MALICIOUS

PDF

69.0 KB Created: 2020-11-17 09:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1d17bba9ae319172de294b289a5cfe9a SHA-1: 237fe0135ede98bc95dd6442f24094cdf3c0f41c SHA-256: 78575daf9c53f3a51387e8dd3bf83383947adb196ce3b648f87126b9a775125d
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://trafftec.ru/123?utm_term=toothpick+bridge+building+contest PDF link annotation
    • https://suxuwimuwudex.weebly.com/uploads/1/3/4/6/134641155/pakowafetokijur.pdfIn PDF document text
    • https://pojosividadom.weebly.com/uploads/1/3/4/5/134524524/78573a554d8f9d.pdfIn PDF document text
    • https://rozozejowetape.weebly.com/uploads/1/3/4/5/134510424/1543765.pdfIn PDF document text
    • https://zewonawexekuke.weebly.com/uploads/1/3/4/3/134318694/3862151.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/gevozodokip.pdfIn PDF document text
    • https://fizolapojola.weebly.com/uploads/1/3/1/3/131383549/vovupojarav_kemom.pdfIn PDF document text
    • https://vesexifog.weebly.com/uploads/1/3/4/4/134491049/xusazijisa_xusedawudofepux_zuxof.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/b39b7725-404e-46eb-ad4d-9a6e72dc0b2e/anarchist_cookbook_1971_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f09f1d5-5477-4e83-b69d-2865e0f929b1/31214381749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159f9171-dada-4721-b129-57114a0931f5/add_1st_edition_equipment_list.pdfIn PDF document text
    • https://s3.amazonaws.com/takeju/56193626066.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/bihar_board_10th_result_2013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3666f153-dbb8-465d-99ae-fc6fdb724868/samsung_rf260beaesg_aa_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb80cfa-159b-4b9e-a5e2-ab413cbd28d1/dnd_5e_hexblade_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b1464f-d427-4f93-9f10-df971128d8c3/93330397267.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 8

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_off0000cfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDD 5280 bytes
SHA-256: a843747f2d679a1159f02829902533811076812f75c189a0b15c95d03f3ec7bf
font_01_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 10516 bytes
SHA-256: 49f5b4c0f3d3cba52c931e37115a59139674762956bdb03425c5d47761800596

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