Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b45e8453fa0d003…

MALICIOUS

PDF

99.9 KB Created: 2021-04-03 02:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4ff3e0f180557121b81c988470bf1ff5 SHA-1: 326db812baa702552fe9fb04151f52d65b097ec6 SHA-256: 1b45e8453fa0d003e08d45cf0b0f84da4c75e8b5d05aa4f5794fafc47ef56480
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://pelibifir.ru/strik?utm_term=dark+souls+2+cheat+engine+ps3 PDF link annotation
    • http://voninizi.iblogger.org/authentic_happiness_indonesia.pdfIn PDF document text
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/7871588.pdfIn PDF document text
    • https://tijozamuworibop.weebly.com/uploads/1/3/1/6/131607374/1172531.pdfIn PDF document text
    • http://tadigewatogonun.22web.org/braven_brv-105_caracteristicas.pdfIn PDF document text
    • http://neludetewul.22web.org/solid_waste_management_text_book.pdfIn PDF document text
    • https://jijixedo.weebly.com/uploads/1/3/1/3/131398351/tuvil-selipekomedi-doguf-lidebabaluguxi.pdfIn PDF document text
    • http://wadigajore.22web.org/excel_keyboard_shortcuts_mac_vs_windows.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/96932711-6d93-4e7e-a303-ff107177e37e/best_introduction_to_computer_science.pdfIn PDF document text
    • http://godavuvexo.epizy.com/57161039488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192f5539-285e-41cf-b742-1831328dfbe1/9432092916.pdfIn PDF document text
    • http://nawopadawejiw.epizy.com/74463464596.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/vuxefoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b60342-1a12-4d60-ae40-ede7f5c1c640/how_to_change_battery_in_sony_mdr-rf985rk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2393e93e-6cc5-467b-9266-4026217a5483/frmulas_de_geometra_del_espacio.pdfIn PDF document text
    • http://nonavijewiw.epizy.com/love_story_piano_music_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/what_is_the_relationship_between_scarcity_and_making_choices.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_off000146ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146ED 5552 bytes
SHA-256: dbfd07973dd87ff5d75bcfc6da8d0dd30681f4bd82307ad8d23b134876b53b0b
font_01_sfnt_off000159d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D6 11520 bytes
SHA-256: 9206ea76fff80fecdddb31a415b17ac84d0ce83f2c7aaa6004c0c472d2d67b0b

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