Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a1763445339264…

MALICIOUS

PDF

77.8 KB Created: 2021-04-15 17:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c01a432ccad365e2489c26dfe21b7c8e SHA-1: ecd68737cc4347636611b15f2b974e001118aa36 SHA-256: 42a1763445339264634d229b47821d939c816fdb409c54e6a9e47f8f12e20fa8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated SEO-style links, indicating a link farm or phishing attempt. The primary URL, 'https://vilenefex.ru/strik?utm_term=how+do+atomic+clocks+work', is presented as a search result, likely to trick users into clicking it. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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/strik?utm_term=how+do+atomic+clocks+work PDF link annotation
    • http://nopotaz.medianewsonline.com/assurance_and_insurance.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/87188248430.pdfIn PDF document text
    • http://dukafufuxona.iblogger.org/jiperupalafanoresakatosom.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://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_17968957665b495c8ca9fefb3e32dd7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/gta_san_andreas_cheats_pc_superman_cheat_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/48827348077.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_a705b5b8101a49a3b6985b6c21f3cf5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7692be03-a662-4c40-ba32-5668326d34bf/roadmaster_sequence_bike_review.pdfIn PDF document text
    • http://nokigabexotuk.rf.gd/39754701956.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/9403726141.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/22786558140.pdfIn PDF document text
    • http://lapapagidufabo.rf.gd/73378620924.pdfIn PDF document text
    • http://demiwadipojaz.epizy.com/64951056717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c811b5c1-1526-4ba8-9607-1ae7f1b89069/marlin_336_scope_base_torque.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c9aafe-5b5b-4553-bd59-13db40a6d028/xifonum.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/analogue_clock_screensaver_free.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/pengertian_descriptive_text.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/resume_builder_template.pdfIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/73299871808.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_f6a8d403f01948f8837aa29cbeb73369.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/10083730148.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_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 4764 bytes
SHA-256: f9157bff2ad33ab524216d053889e61759c94d64a39082bd09c24f91e1dd2658
font_01_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 10816 bytes
SHA-256: 3dfffe40b497c9c03fc0ecb950a59cd0c6eabe537535ecb2d52b30242f48d72f
font_02_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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