Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f637a99a84c968a…

MALICIOUS

PDF

77.6 KB Created: 2021-04-06 07:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 38154c9f525de95331899d0eb3a732fc SHA-1: c7a2796eac0f22d801c1fcbe29c431e830197d4c SHA-256: 2f637a99a84c968ac980159dbf62f8c8de5f9ea8a7664056d9b165eb2fcce45d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ponafet.ru/strik?utm_term=microsoft+visual+c%2523+2010+express+registration+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425507/normal_604a512435a00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_606b1da5c41a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482403/normal_5fc69f4c9979e.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/Oqhhia4/burrell_advertising_agency_chicago.pdfIn PDF document text
    • https://gidorimafemona.weebly.com/uploads/1/3/4/8/134867851/1283726.pdfIn PDF document text
    • http://vumejopiraxu.mywebcommunity.org/cambridge_english_advanced_1.pdfIn PDF document text
    • https://fujifarilopo.weebly.com/uploads/1/3/4/4/134483008/6581837.pdfIn PDF document text
    • https://mewirolubeb.weebly.com/uploads/1/3/4/4/134446630/8511198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388038/normal_605002a78ee1f.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/hcjeyhf/sajuzinevurem.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/iaicVig/willie_nelson_songs_sung_by_other_artists.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/grade_9_math_textbook_answers.pdfIn PDF document text
    • https://gukilebulasule.weebly.com/uploads/1/3/2/6/132682884/591d9401cb8b29.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/EgfB6tn/62509026640.pdfIn PDF document text
    • https://defireser.weebly.com/uploads/1/3/4/3/134347292/2221258.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://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_bd536c71a55742df8a2867cf427a1b51.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_9d9911e17d8d47599823cef8b3db1eea.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_20e2d1a75872400b98bd6b9bf978143e.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_c871be834b734ea399e8df425934eb46.pdf?index=trueIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_1431b5f3ded547e99de98e6644f8626e.pdf?index=trueIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_3e39fc9eaf6241abb91ed882a0726bac.pdf?index=trueIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_cd04a759f9ac47bab1b69fa5d0dd73a3.pdf?index=trueIn PDF document text
    • https://6680615c-3592-42a6-94f3-b98e474b5330.filesusr.com/ugd/252546_ce1c081f7efc4de0beb15f9447ed9c48.pdf?index=trueIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_081fc9c299fb4e2ab4e24905394ca65b.pdf?index=trueIn 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_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 4600 bytes
SHA-256: 5a2413b6c429df1c9c54745985742f32528e22fb317a7a7a70513e3b5b5ec973
font_01_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 10532 bytes
SHA-256: e525c295b55f3683b122e5333ccea479cec1addb95864e95ee5c602cfccc6c10
font_02_sfnt_off00011a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A76 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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