Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8dc715a1218975…

MALICIOUS

PDF

85.8 KB Created: 2021-03-19 16:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 700878dbb5032a78341f18486a00fdaa SHA-1: 674352e270c47dbc88b598418a4797e7b4659c99 SHA-256: 4d8dc715a1218975266511c5c12ed399193ebaf6f48cecdee47aa0c27aaa9d17
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'https://dafemum.ru/aws?utm_term=computer+programming+courses+melbourne', which is likely a phishing or malware distribution lure. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. No scripts were extracted, but the presence of external URIs and the malicious verdict strongly indicate a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/aws?utm_term=computer+programming+courses+melbourne
    • http://trackengine.host/sunflower_river_blues_tabq2ir8.pdf
    • http://minesaxofunawi.getenjoyment.net/19391753254.pdf
    • https://cdn-cms.f-static.net/uploads/4380228/normal_602e35cb63931.pdf
    • https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/5880281.pdf
    • https://cdn-cms.f-static.net/uploads/4378153/normal_6044cc655bcb2.pdf
    • http://lg-supportteam.com/nutokeximuperegofulufafu7h7da.pdf
    • http://suzofovolavuk.scienceontheweb.net/wakefufufez.pdf
    • http://lexamopelezun.mywebcommunity.org/bpsc_prelims_2020_result.pdf
    • http://balifruit.com/27150874438p22da.pdf
    • http://lnstagram-helping.live/923274253291n8xp.pdf
    • http://getallcreditscores.info/snake_eggs_in_a_dreamdmze2.pdf
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/nusigomipeboxul_kujiko_fajawasagela_nemufaramok.pdf
    • https://mufudoxideli.weebly.com/uploads/1/3/4/5/134508761/6634548.pdf
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/zaneminag_tubumolakixox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_7ceaf2e829864e668df4cc7a8a7f5ca3.pdf?index=true
    • https://s3.amazonaws.com/zalomi/potapajeno.pdf
    • https://s3.amazonaws.com/ninasivol/survival_skills_primitive_location.pdf
    • https://165abacb-5525-4e66-971c-c167d859e756.filesusr.com/ugd/f3f2a5_d1e4bf3348e34c6a8d4ae4cc7f4946bc.pdf?index=true
    • https://s3.amazonaws.com/kakekojezutok/guided_imagery_and_music_gim_therapy.pdf
    • https://s3.amazonaws.com/kelageketisefuv/watevitadonoremaxaduru.pdf
    • http://nosigegu.onlinewebshop.net/what_is_a_loop_in_programming_language.pdf
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_1f3846d9d1f143d8980e7bae57ed2931.pdf?index=true
    • https://s3.amazonaws.com/vufuzewasi/59763115136.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_off0001113a.bin
8abd76cfb6277023c7772986e8f13e0d736d05ed83149289d5f29b4ca162e267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 5300 bytes
font_01_sfnt_off00012321.bin
53607bd9833090315db874b0df7b0a904bdad435a9e9d0e9498a2806808a55fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 11348 bytes

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