Malicious PDF — malware analysis report

Static analysis result for SHA-256 5feb82780138cc2e…

MALICIOUS

PDF

83.7 KB Created: 2021-04-26 10:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f2b43d2df2f58851a35bf3fea9ff591b SHA-1: f86bda64f3d257b85b7d62d95124df3c96a4c233 SHA-256: 5feb82780138cc2ea6da3572f10e907bf83aee4de65a460def1b1a12a1a733df
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many of which point to disposable hosting and redirect to potentially malicious sites, such as the one at 'dafemum.ru'. The document body, though heavily obfuscated, suggests a lure related to 'word search books for adults ireland', likely a pretext for directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=word+search+books+for+adults+ireland In PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/xibajirapufuvutij.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/oghihas/why_isn_t_my_tv_remote_working.pdfIn PDF document text
    • http://sibuvre.com/20384274333hpycl.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/HYtFid4/16441445899.pdfIn PDF document text
    • https://cdn.sqhk.co/dunuxorigu/pgiQGU9/bakrid_video_song.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/jhTyjiy/24785149859.pdfIn PDF document text
    • https://fezewozigu.weebly.com/uploads/1/3/4/3/134318815/9979877.pdfIn PDF document text
    • http://static-get.top/51216322005c9l90.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/54jjZhg/perfect_piano_notes_telugu_songs.pdfIn PDF document text
    • http://mazanatur.space/199372420997xozm.pdfIn PDF document text
    • https://cdn.sqhk.co/kisudosus/ifPgjjd/93400094905.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/cv2ifhi/at_t_mobile_security_ios.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://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_5affeefbf8a04c81bdefa1eae6e0d2b6.pdf?index=trueIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_57e9c11a6f2a440299434a6ae4fe4163.pdf?index=trueIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_f96d242d3c334152a62b0034e98fdda6.pdf?index=trueIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_05357d668df149699a2d5a8497ed320b.pdf?index=trueIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_d471a6b6804943938cd3ce076fd45bb5.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_90a222b5669c47e3b067a0f39f68af5e.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_305454535c8343efb9e56f20a8d14232.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_dead6579b5614fc89c1e048f3a5d9a79.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_7e67aa2a4e564479bf485b05cb47b603.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_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 5208 bytes
SHA-256: d18f754d036e2fffe4b7179a6939ca5682abf2fb2f1d25d0683940c0aa7e7b05
font_01_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 10704 bytes
SHA-256: 342aa8cc989490a386f0a87016297613a4c4c1e2b70492e7193f2a3d29b3bf80
font_02_sfnt_off0001316e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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