Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fad5cc126836e8…

MALICIOUS

PDF

74.1 KB Created: 2021-01-03 06:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9e4a1031ab61f436aaca5ca1c191c51a SHA-1: 94b6162bc130a9b35881f816da38f47f02d8c914 SHA-256: 79fad5cc126836e8cea2b383a90648d01eb83d23af7c1b98454608cd6834f720
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 0.9997

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://traffnew.ru/123?utm_term=how+to+cite+the+bible+apa+7th+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f933fc66057a.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/mojurokemi-lebokidafe.pdfIn PDF document text
    • https://cdn.sqhk.co/palazawu/eoWhhdM/90522683481.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/9961a82d71f.pdfIn PDF document text
    • https://dolumipekino.weebly.com/uploads/1/3/4/6/134625527/9091128.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/78b3cd7dd648db0.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/pegek.pdfIn PDF document text
    • https://dunujamovexen.weebly.com/uploads/1/3/4/3/134361976/220043.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/aeeeb82a-085f-44a3-b507-694c10f967d3/copter_game_download_for_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/384f3e3c-d452-4702-a73e-0b9f5c0a5b8d/focussed_or_focused_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35620d8f-ab52-4904-9442-affe3331ae82/41164243615.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/energy_forms_and_changes_simulation_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08dde95c-6cc5-4b27-aa94-187cfb77edcb/the_weather_channel_radar_live_streaming.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/jiberiruwuwurivumekonagil.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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 4948 bytes
SHA-256: d016cab3972974363f46456738c30f4d80e0dbcf11a7b00140c48aead3dcb998
font_01_sfnt_off0000e727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 11064 bytes
SHA-256: 484291efa4d3c0d6c78b60d55cda51e5cc40257adb050b2355d1772fe0b441e7
font_02_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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