Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb759f0f170a8292…

MALICIOUS

PDF

67.1 KB Created: 2021-03-31 03:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f2c2d1bda8ccb8735fea2f1bd2ffc5f SHA-1: 65a13dc1f79417144d9be4b2b98313a6fdcbefd9 SHA-256: eb759f0f170a829270c6fd4b7882966a89061d92663478ca52303337d88980e2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malicious intent. It contains a large number of external links, suggesting it is part of a link farm designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets.

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://leonvi.ru/wix?keyword=geometry+trig+review+worksheet
    • http://update-win20.online/36777276132p1o1w.pdf
    • http://walkover.me/lefiwebaxuxachoo3.pdf
    • https://cdn.sqhk.co/rivitovolu/i1ickPD/vujixidelonerowagiwole.pdf
    • http://povar2020.site/introductory_phrases_worksheetepryf.pdf
    • http://doucheop.xyz/266231045938lbj.pdf
    • https://zudejuzire.weebly.com/uploads/1/3/2/6/132681250/9854213.pdf
    • https://cdn.sqhk.co/muwazubivotu/cajcihF/55774005003.pdf
    • https://mokabeninenaji.weebly.com/uploads/1/3/4/0/134013120/vapasududize-jinazifat-zeboroxajise.pdf
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/veridutugotasez-bamegetoz.pdf
    • http://getdouche.xyz/52863204473pixlu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/punurum/alikiba_song_mwana_video.pdf
    • https://uploads.strikinglycdn.com/files/41705060-133a-4558-ab5e-6d91a902eb8f/lapamolunajidirolafaguf.pdf
    • https://uploads.strikinglycdn.com/files/a218444a-3965-4a83-9543-ae99dda3f77b/koxesetobinogipi.pdf
    • https://uploads.strikinglycdn.com/files/3f8edb54-7715-4f14-859d-bab2307dc6cf/kigotisomifarotesitipan.pdf
    • https://uploads.strikinglycdn.com/files/c288ad1a-fe30-4570-bca6-fed1387f3a31/dot_net_with_c_tutorial.pdf
    • https://s3.amazonaws.com/benuka/besima.pdf
    • https://uploads.strikinglycdn.com/files/8552bbc0-2708-4e6f-931c-04f361296bde/sonotodulepagewelis.pdf
    • https://uploads.strikinglycdn.com/files/a4ec4f5d-3a4e-4415-af4e-68cc3aa1ea08/best_words_to_describe_food.pdf
    • https://uploads.strikinglycdn.com/files/27c2a643-a229-4bee-b1e9-1ca2a07c1e11/texas_instruments_ti-84_plus_ce-t_python_edition_games.pdf
    • https://uploads.strikinglycdn.com/files/1af03f9a-b961-4cf4-83dd-ab8cb244e32b/80926384821.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_off0000cc50.bin
8b78f80d8309945430d716c92bf42c31e304142e144300f8cbc891c14e19bfd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC50 5204 bytes
font_01_sfnt_off0000de00.bin
814f8ff2d16ea18b2769c57ee4e062d3c4ac95a7eb094769aca26ff79c73d232		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 9780 bytes

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