Malicious PDF — malware analysis report

Static analysis result for SHA-256 b877f8358e259011…

MALICIOUS

PDF

77.6 KB Created: 2021-03-31 01:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5fce7863287921e6353b40fad2befb25 SHA-1: 197370d09bea147a4bfb6193aaabcd76217b4a59 SHA-256: b877f8358e259011e6790ffa65f2182e4ce6c6821d4c0d6020624f8a373232b2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious download attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to download further malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=decision+support+and+business+intelligence+systems+pdf+free+download PDF link annotation
    • https://tiwavejesuma.weebly.com/uploads/1/3/2/6/132681866/gawuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_605658bbc7fdb.pdfIn PDF document text
    • http://betflixguvenilirmi.com/29055457937n18nm.pdfIn PDF document text
    • http://supernefritroller.xyz/38741382697ln500.pdfIn PDF document text
    • http://minuette.me/apa_manual_deutsch2rcjv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384628/normal_5ffa9c24da514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_601f0da35d51b.pdfIn PDF document text
    • http://kimelaxuwivupa.iblogger.org/96337740627.pdfIn PDF document text
    • https://fumabufoduf.weebly.com/uploads/1/3/5/3/135313851/genasolokiwogog-milen-wixenuvab-nikibelefo.pdfIn PDF document text
    • http://vorecan.fun/89339620348jtztf.pdfIn PDF document text
    • http://flipping-car.online/4k_video_er_websiteo1l5e.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://s3.amazonaws.com/xuzakob/30043220084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e687cd5c-da0f-4fe6-a670-382ace294cb2/how_play_flag_football.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/74699276957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5dae7c-0110-46b1-970d-78c0a086fb9b/how_to_set_my_heating_thermostat.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/44892743589.pdfIn PDF document text
    • http://fujebaxe.epizy.com/pokemon_red_strategy_guide.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_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 5692 bytes
SHA-256: 77d1319635fe4dd5ce2f3a00908c716f46d02ab0258a6980a32dfa001aebf293
font_01_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 10736 bytes
SHA-256: 681fb89e8fb763fed7c590bcdc2308ef6f6d23858c37c754d72ecd9a2b6e018d
font_02_sfnt_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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