Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5c2a4a2d07dffd…

MALICIOUS

PDF

77.3 KB Created: 2021-03-23 19:13:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6c8708ba9fa59798705a712232b68bf SHA-1: 1e8e7c90c7520a27de3ddf41d45047a37083eed3 SHA-256: 6f5c2a4a2d07dffd7dbdb9997d0a7134de4409e1aaa24a701b4d40a532beeff6
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, with a heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://golowaki.ru/wix?keyword=bits+bytes+and+bots+summer+camp', suggesting a potential phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=bits+bytes+and+bots+summer+camp
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5ffc104684c45.pdf
    • https://cdn-cms.f-static.net/uploads/4475854/normal_602ebb730684c.pdf
    • https://static.s123-cdn-static.com/uploads/4374976/normal_5ffec37e28b4f.pdf
    • https://cdn-cms.f-static.net/uploads/4414868/normal_602b2c3c0fd19.pdf
    • https://cdn-cms.f-static.net/uploads/4389394/normal_601ff78113a25.pdf
    • https://static.s123-cdn-static.com/uploads/4403129/normal_5fe5e8a5021a9.pdf
    • https://cdn-cms.f-static.net/uploads/4485305/normal_6018edfbc66ac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kotidox/82542785611.pdf
    • https://s3.amazonaws.com/tuxenipup/7th_grade_math_test_with_answers.pdf
    • https://s3.amazonaws.com/zidenigad/ipcc_special_report_climate_change_and_land.pdf
    • https://s3.amazonaws.com/jewizopukuni/dell_m6800_battery_not_charging.pdf
    • https://s3.amazonaws.com/farowug/39873374951.pdf
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_cc51924f02304f41ab2a291306ef0737.pdf?index=true
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_121c9f1674054859be000bdc0e8eaca4.pdf?index=true
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_3359e10c71124b9c85658ef6e07dd1f8.pdf?index=true
    • https://s3.amazonaws.com/gelawiweza/beep_beep_alarm_ringtone.pdf
    • https://s3.amazonaws.com/guxosa/bob_books_set_1_beginning_readers_free_download.pdf
    • https://s3.amazonaws.com/jevelel/miranerujovugive.pdf
    • https://s3.amazonaws.com/nawosineromigi/the_african_origin_of_civilization_chapter_3_summary.pdf
    • https://s3.amazonaws.com/fibesezati/pufojizo.pdf
    • https://s3.amazonaws.com/wizakokowe/40241401951.pdf
    • https://s3.amazonaws.com/lusegokaves/fubitafuviwapaxivolibi.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_off0000ea04.bin
94fe0371df4e5567d61a5effaa4b74a49507ca8ec02b668ad71a7f0a75104306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 5476 bytes
font_01_sfnt_off0000fc91.bin
4953ea67bc4a151dcdf475599903c672118f622204c4de59cca3c28b8d15c611		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 12504 bytes

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