Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e38eb16fa9747aa…

MALICIOUS

PDF

64.5 KB Created: 2021-03-29 07:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b5d9699974f6013a84ec07ea1dbf1d5f SHA-1: c39f822d1dd1ffb2cc8aa71e0d2a336586cd0a24 SHA-256: 2e38eb16fa9747aaef1281dccf7f585cbed5ae2b503645333d918159bff981f5
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm and an SEO redirector, indicating a malicious intent to direct users to potentially harmful websites. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan distribution attempt. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/123?utm_term=binding+of+isaac+items+sheet+unblocked PDF link annotation
    • https://cdn.sqhk.co/sovanoniwuva/NIhjQid/matchington_mansion_update_issues.pdfIn PDF document text
    • http://mosuzovopij.22web.org/xisidi.pdfIn PDF document text
    • https://cdn.sqhk.co/gugapedulob/ibFrgdS/38297023674.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/dUchbjd/storekit_ios_14.pdfIn PDF document text
    • https://cdn.sqhk.co/jijubexovoz/burpmT0/peron.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kokiralasido.epizy.com/21654116826.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/total_gym_supreme_assembly_instructions.pdfIn PDF document text
    • http://zamasadexemu.rf.gd/72120066624.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/99895829115.pdfIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_38e93b14637c40d99261b0c5b08d29b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebisop/guided_busway_easter_timetable.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/diamond_inama_video_mp4.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_77cffb0e87a54e47abb87b175ce05e6f.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_004ad66dba894f0b97338d170ac67e90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/opera_browser_offline.pdfIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_99cb75ce6c7c46988bb3753b1b379db7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/bose_soundlink_revolve_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/zopelilipobe.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/laretakogodat.pdfIn PDF document text
    • http://lekugonaj.rf.gd/8730604715.pdfIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_ea5c517c286b4054a6d2bb3bab9feae8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wejuvono/tifilotaxewe.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/can_you_use_jumper_cables_on_a_motorcycle.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_off0000c1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C4 5592 bytes
SHA-256: de12d31b3f5d3d1327c09b81505fbdc289450cd1cb4f37669a97fa8bc5fd8737
font_01_sfnt_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 9368 bytes
SHA-256: 8780f2b306e924ab99a1b0084d8e032d748701dc05505675f38a815227fb4141

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