Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f7d8add3cc8938…

MALICIOUS

PDF

74.3 KB Created: 2021-03-27 12:25:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e80d69d602a53419738df98a07509185 SHA-1: c75fef7681dd60f44a43f874e65807b034536fac SHA-256: 85f7d8add3cc8938ff1cee3522ae7373d968f38da96ec9119d0b583fbc15561b
196 Risk Score

Malware Insights

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

The PDF document contains numerous external links, indicative of a link farm, and is flagged by ML classifiers and ClamAV as malicious. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's intent is to trick the user into installing malicious browser extensions or updates. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://lozipotod.ru/award?keyword=pdf+converter+compress PDF link annotation
    • https://cdn.sqhk.co/buvaboda/4UihXoa/ikea_desk_lamp_bulb.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/6b52f7f6940.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/jcFRLY9/bosch_classixx_washing_machine_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_602e6e6fb567c.pdfIn PDF document text
    • http://eurosett.net/gmc_15_amp_10_sliding_compound_miter_saw_manual68vm0.pdfIn PDF document text
    • https://cdn.sqhk.co/demawanetufi/gzpWbNv/top_trending_tiktok_hashtags_right_now.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_601f257bb533c.pdfIn PDF document text
    • http://leopolds.space/at_t_digital_life_chat_supportr6nop.pdfIn PDF document text
    • https://tufojeju.weebly.com/uploads/1/3/0/7/130740258/nunalo.pdfIn PDF document text
    • https://keboxineb.weebly.com/uploads/1/3/0/9/130969034/3341232.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/cAijieq/meaning_of_neighbour_in_punjabi.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/fM8j8iO/hero_wars_tank_tier_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wefadep/tapifadejulibabidufujuw.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/wupinusa.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/how_to_clear_stock_in_transit_in_sap.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/23321328473.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/62507827598.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_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 5120 bytes
SHA-256: 4873998d8ee0352e958384134621692033192e67e5ffe2d882c107123ce7af71
font_01_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 10824 bytes
SHA-256: aed5b42288271c07824182034279cd4f3b9609afe66a0f9b5e39b8e1685f5670

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