Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a5259d1fc308ab…

MALICIOUS

PDF

75.3 KB Created: 2021-04-30 18:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60143bde877a4efb64c44da8c068b724 SHA-1: 88f60b540996fc80c8e239caa374a5ad59ec9a53 SHA-256: b6a5259d1fc308abc9aa98b66202adf16cf27550b7ce603806c33de8b209a3aa
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to direct users to potentially harmful websites, such as the one found at 'resalured.ru'. The document body, though heavily obfuscated, appears to be a lure related to an essay title, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=pen+is+mightier+than+sword+essay+in+hindi
    • http://dududuw.mypressonline.com/how_to_set_citizen_eco_drive_nighthawk.pdf
    • https://cdn-cms.f-static.net/uploads/4447640/normal_6035335244aef.pdf
    • http://tovarzone.ru/992755033271zymu.pdf
    • http://usacarins.com/398247210987jr6i.pdf
    • https://cdn-cms.f-static.net/uploads/4383791/normal_601dbde384d8b.pdf
    • http://dommasters.site/spark_definitive_guide_download_freeszdn4.pdf
    • http://vomimaforotagi.mywebcommunity.org/gewekilafizasugopirutu.pdf
    • https://cdn-cms.f-static.net/uploads/4404955/normal_603532e588f68.pdf
    • https://cdn-cms.f-static.net/uploads/4418166/normal_6060f495d6067.pdf
    • https://cdn-cms.f-static.net/uploads/4456666/normal_603ebbc3bab4c.pdf
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5fddaff839dc6.pdf
    • http://lutirojibafap.sportsontheweb.net/penyakit_jantung_koroner.pdf
    • https://static.s123-cdn-static.com/uploads/4490746/normal_6007f083beda9.pdf
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5fd27cc87d7e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/60ff36ed-e9e2-4451-bb53-b8ae83ba6ddf/how_to_reset_zebra_gk420d_printer.pdf
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_b0839c5a540744cc91505a1163ff1a0f.pdf?index=true
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_143f2f80d3d94dd887f99d9a7af0a183.pdf?index=true
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_f83106dc34cb4da7a44c1c7f21ab84f1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5ce19a0a-f8c7-4360-927a-199f71a979dc/85543798685.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd4.bin
c1c43bb6f687e301836b163b309d79623007aa08bb2effd5ef3d4eca8766f43f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 5400 bytes
font_01_sfnt_off0000fe17.bin
c9be2ca1e2df81b825d0c0adc281a47b6df4154311bd47b0f24d6b90d35b7d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 9940 bytes

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