Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c37468f4d767e76…

MALICIOUS

PDF

101.9 KB Created: 2021-04-21 07:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4f5719d687c71aa978778ffcf66dc668 SHA-1: ce8cdce0dbbfa5d91a7618574c97d324c0b7d497 SHA-256: 0c37468f4d767e76dc3134768914ea653233f1b4ebc1fba8d4895c8cd62f7e07
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://pelibifir.ru/strik?utm_term=matlab+plot+legend+two+rows', are likely used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=matlab+plot+legend+two+rows PDF link annotation
    • http://trysoda.pro/holes_essentials_of_human_anatomy_and_physiology_9th_editionfq0kx.pdfIn PDF document text
    • http://dkmz2.club/588904944215bxu8.pdfIn PDF document text
    • http://idslim-italia.site/bobasofi8pdyh.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/cc292a7a97e2.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/bojuto.pdfIn PDF document text
    • http://mscgis.net/78659750011snqj5.pdfIn PDF document text
    • http://detonic-official.website/xaditoladuy94o8.pdfIn PDF document text
    • http://goldstein.berlin/what_day_does_walmart_restock_baseball_cardsfavmn.pdfIn PDF document text
    • http://walkover.me/can_a_beginner_run_a_marathongqlp9.pdfIn PDF document text
    • http://item-get.top/how_do_i_calculate_water_flow_rate7c5cu.pdfIn PDF document text
    • http://ompala.store/49er_drive_in_theater_sacramento0ivte.pdfIn PDF document text
    • http://tekplafond.xyz/black_hole_formation_gif8ohzo.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://a0758896-f8c2-4fc9-8c7e-5c1738e8bc18.filesusr.com/ugd/0ce882_ef9ff63258b74eb39b856bf250dd2f92.pdf?index=trueIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_14ff4c9c813c4ef5a77ec3fdc8d5c2fa.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_6d7c3d889f23432e8ca03f221ae88fd4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e49c8c5-b4b8-45f8-b751-5f4314012b88/77746947922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47309ddb-a949-48ea-af74-9d350f091973/gamesir_controller_pairing.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_6a0793494dc74aba9d284d8fe40ebfd5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76621fe4-1dcd-4f8b-b0d5-d940f037ef1c/beethoven_piano_sonata_in_f_minor_op_57_appassionata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce282f48-719a-43c3-9652-6c07f6fc7a5b/61187031183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72d4608-9efd-4bb2-9a96-9c760fb3e272/fajuveke.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 26256 bytes
SHA-256: 761652e57ca3d5911e48c08acfb62b7f337ed9b38034b5e821ae2695885d46c2
font_01_sfnt_off000141d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D2 5104 bytes
SHA-256: e0bc659273f7a8c61bafcf2b85a0ad8a751f794e81659292a0825392de4c5f2b
font_02_sfnt_off00015344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15344 11064 bytes
SHA-256: 5519fdfd595f807ea49ccd48d8d1da269318e0358aa198be1d97360fb7a89df4
font_03_sfnt_off0001793d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1793D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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