Malicious PDF — malware analysis report

Static analysis result for SHA-256 3828d443791ba8f4…

MALICIOUS

PDF

76.0 KB Created: 2021-04-01 20:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29becd49eee70fe83da957dde6425b88 SHA-1: 4f16390ccf1db1857fe9e7e647939961d747bc22 SHA-256: 3828d443791ba8f44bf0781e56e306aecf75c1e93d47a626645c805276293545
136 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan and identified by heuristics as an advance-fee scam lure. It contains multiple embedded URLs, one of which, https://xezojetit.ru/123?utm_term=aviation+english+book+pdf, is directly associated with the scam. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest it is designed to trick the user into visiting malicious links or downloading further payloads, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://xezojetit.ru/123?utm_term=aviation+english+book+pdf
    • https://cdn-cms.f-static.net/uploads/4476142/normal_60543269d6153.pdf
    • https://cdn-cms.f-static.net/uploads/4488817/normal_5fd881c8e7e25.pdf
    • http://fakaluwu.scienceontheweb.net/mofilesinan.pdf
    • http://mp4.design/bugatti_hd_wallpapers_1080pi7k35.pdf
    • http://golixudib.mypressonline.com/sasolifolesugazigonafa.pdf
    • http://razvivatel.blog/6865431036eomkc.pdf
    • http://mugukix.mygamesonline.org/lebinukis.pdf
    • http://closemaze.com/92519070310xfe6j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8159c32b-9ef6-416f-b801-ede701077633/romeo_and_juliet_law_colorado.pdf
    • https://s3.amazonaws.com/wizomoravazub/best_history_of_china_podcast.pdf
    • https://uploads.strikinglycdn.com/files/204d55e7-4ec7-4b93-be48-0d1df8a2abca/vingcard_2800_locks.pdf
    • https://s3.amazonaws.com/bikikanafopavu/acting_101.pdf
    • https://uploads.strikinglycdn.com/files/7bc38ea3-5e10-4eee-ba2a-202c45a7a2b8/vozabojimakudo.pdf
    • https://s3.amazonaws.com/rimejiguvif/12748916462.pdf
    • https://uploads.strikinglycdn.com/files/319d0356-7f65-4d2e-baf5-8dbbce92d551/wenemituzefanu.pdf
    • https://s3.amazonaws.com/jesidofefe/graphic_design_essay_topics.pdf
    • https://uploads.strikinglycdn.com/files/92c2c894-175e-4545-85e2-fc23970c484c/lagikasunovonupajaxozuxax.pdf
    • https://s3.amazonaws.com/xeruxaxer/us_anthem_piano_sheet_music.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_off0000e53b.bin
b9998e256658541b3225b25db5b1f1ac1834642a4431d0bda5585d96dd1d755f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 5460 bytes
font_01_sfnt_off0000f7d5.bin
2c14cd765e2c261aa285023308e08649760eb5814e4ff6f82c182ffefc2e3b9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 14096 bytes

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