Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4772c0c6ca82904…

MALICIOUS

PDF

70.6 KB Created: 2021-03-28 08:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5589ee706821d5bad0d78a24ab789223 SHA-1: dc04652d7fefa1a36de18234cf99f1227c68153e SHA-256: b4772c0c6ca82904ef6d57d1e7c38c1d1517954bd7d2476f70e2758a09b18ddd
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://zajinet.ru/strik?utm_term=understanding+unix%252Flinux+programming+github', which is likely a phishing or malware distribution lure. The document body, though heavily obfuscated, suggests a technical topic, potentially to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=understanding+unix%252Flinux+programming+github
    • http://revunazem.22web.org/91588963066.pdf
    • http://xawegap.mywebcommunity.org/rodonokosuzuxabutumusori.pdf
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/34fb1bc53f91.pdf
    • http://detozube.scienceontheweb.net/30374307674.pdf
    • http://vibuluvizawo.66ghz.com/wipomolavorojuw.pdf
    • https://burerekubexu.weebly.com/uploads/1/3/1/3/131381452/c2e2a.pdf
    • http://zidexogatik.22web.org/jenivoralat.pdf
    • https://cdn-cms.f-static.net/uploads/4494663/normal_6011a9943da27.pdf
    • https://static.s123-cdn-static.com/uploads/4409840/normal_5fdd26f0bbebe.pdf
    • https://cdn-cms.f-static.net/uploads/4493602/normal_604310e551df2.pdf
    • http://pekokaxa.22web.org/58837811765.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c9b22d8c-aa2a-4a5d-8555-38c8d4a503f4/sadep.pdf
    • http://rovunebezub.epizy.com/39101832843.pdf
    • https://uploads.strikinglycdn.com/files/254ad48b-7005-480e-b325-366c6f7a0ca6/do_workouts_count_as_exercise_on_apple_watch.pdf
    • http://tegufomaliduki.epizy.com/wujetogurixikimifopedata.pdf
    • http://dukizovisepo.rf.gd/68522793090.pdf
    • https://uploads.strikinglycdn.com/files/df8cf8fe-8a62-4e80-bcfe-05630eeea85e/59960966099.pdf
    • https://uploads.strikinglycdn.com/files/0442d113-12a9-4450-80fe-592eb9fb8b49/the_entertainer_kt_tunstall_lyrics.pdf
    • http://sofijorube.rf.gd/59883063993.pdf
    • http://zunedolu.rf.gd/google_drive_horton_hears_a_who_movie_2008.pdf
    • http://pivesezo.epizy.com/jquery_carousel_slider_autoplay_free.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_off0000d604.bin
726b1e28ca3cfa594d63a8b298f57c2e9dd852ce2f8c2f6809993dbcdc512a37
pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 5608 bytes
font_01_sfnt_off0000e8f3.bin
ccbadf9efe73e323ddfca6198196d63a78000402e204e13503a8d1288b9ca455
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 10480 bytes