Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86c2c597bd53c1f…

MALICIOUS

PDF

75.5 KB Created: 2021-06-01 02:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70d5eecb4a29e0b39621742a2c004c5a SHA-1: 7315a1d80149c40bac4dc77c3a4554062428811e SHA-256: b86c2c597bd53c1fbbe7b26bd2df5b22aac3cda1031686209985a638295bf0ad
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be related to 'library quiz questions', a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://queure.ru/pbw?utm_term=library+quiz+questions+with+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4487622/normal_601ddee9b583b.pdf
    • https://torewofatovamek.weebly.com/uploads/1/3/4/1/134108613/neleruniz.pdf
    • https://cdn-cms.f-static.net/uploads/4424024/normal_604cbe80a4bc8.pdf
    • https://jujavaxoziwes.weebly.com/uploads/1/3/4/1/134108829/nabatodonilemen-weporiwugoxoxuf.pdf
    • https://jetizezososexu.weebly.com/uploads/1/3/4/3/134352600/8918365.pdf
    • https://lebetazukuz.weebly.com/uploads/1/3/1/6/131606644/pilozo.pdf
    • https://nugekowu.weebly.com/uploads/1/3/4/5/134587082/9955119.pdf
    • https://cdn-cms.f-static.net/uploads/4423750/normal_60632adb6c664.pdf
    • https://gimipozadifan.weebly.com/uploads/1/3/1/3/131380487/7538591.pdf
    • https://sigoberedida.weebly.com/uploads/1/3/4/5/134594083/gejomepupunu.pdf
    • https://fujerituzaxu.weebly.com/uploads/1/3/0/7/130775231/16e90.pdf
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5fdbd46536cc6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bac7cbfd-5e2a-4c5b-86a4-bbe64dd93cfc/diccionario_latin_castellano_online.pdf
    • https://uploads.strikinglycdn.com/files/90804de2-2987-4c85-9120-24d7c3f6d7f8/adobe_reader_newer_version_already_installed_error_windows_7.pdf
    • https://uploads.strikinglycdn.com/files/d76f7f5b-f0c1-49d2-984b-35df569c365e/62475986488.pdf
    • https://uploads.strikinglycdn.com/files/32a0366f-128f-4ee9-98da-b56c94ebadc2/english_grammar_exercises_with_answers_for_class_7.pdf
    • https://uploads.strikinglycdn.com/files/6044a799-ea8d-4d9d-8375-1e94c8cb6c34/36268070256.pdf
    • https://uploads.strikinglycdn.com/files/4b7e42ea-64be-4da3-8c28-14ee8734df42/hp_laserjet_p4015_cartridge_number.pdf
    • https://uploads.strikinglycdn.com/files/beb876eb-c0cf-4f2a-9d6a-adf54716c5dc/90050227752.pdf
    • https://uploads.strikinglycdn.com/files/eea751d3-0b57-4afc-a8c3-1275596e7185/is_kundalini_yoga_good_for_weight_loss.pdf
    • https://uploads.strikinglycdn.com/files/b7ef435d-ae17-4d9c-89c5-777d0e5cbde9/sub_zero_ice_dispenser_not_working.pdf
    • https://uploads.strikinglycdn.com/files/52ac2007-1c51-4ff4-b43f-abf1e8481e2b/52425012314.pdf
    • https://uploads.strikinglycdn.com/files/7917d93b-4a2e-4fad-a615-1333bca9a5aa/vebuwepejajunijalasi.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_off0000e88c.bin
ba47c96b7b487ff93ef540a94edb79d5f6b74b666032a26c60c9c948a9e316a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 5548 bytes
font_01_sfnt_off0000fb81.bin
8dd95e6e931d45d7bc73421ec093f38a599ca5e6053b21c7987b7480f9c4fc2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 10928 bytes

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