Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee517ef00e6faf6…

MALICIOUS

PDF

83.9 KB Created: 2021-04-09 10:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d7c4e292eda5e60b1c8bb817c3a21b8 SHA-1: db669ac7b13191d8a14ea7f5511f6d11e48e1367 SHA-256: 4ee517ef00e6faf6a1783e6f0285582988b5d87008484ec87aebc77f0bb7924c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'Minna no nihongo 1 workbook' and 'wkhtmltopdf', indicating a potential social engineering pretext to drive users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=minna+no+nihongo+1+workbook
    • https://cdn.sqhk.co/vatopibar/cjj3Lgh/samufija.pdf
    • https://rukadewij.weebly.com/uploads/1/3/4/0/134012321/jenazimamawupu.pdf
    • https://cdn.sqhk.co/pejinijew/hj5jjih/pesikalemivate.pdf
    • https://cdn.sqhk.co/fisoxinizo/hgWZbia/w_radio_en_vivo_por_internet_mexico.pdf
    • https://zenujuvevepiro.weebly.com/uploads/1/3/4/3/134317368/2908737.pdf
    • https://najabokaxosol.weebly.com/uploads/1/3/5/3/135300306/guxovin.pdf
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/pilolu-rapubi-sovijewaxaje-saxafuw.pdf
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/3423388.pdf
    • https://cdn.sqhk.co/fagaxirupunu/jgihhda/nitex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kodipopujufipig/arbitration_guidelines_accc.pdf
    • https://s3.amazonaws.com/vavebufevodutob/horseman_challenge_guide_rdr2.pdf
    • https://s3.amazonaws.com/penale/happy_birthday_song_name_wise_free.pdf
    • http://fozilixugijuva.epizy.com/how_to_pair_plantronics_voyager_focus.pdf
    • http://rututovabin.rf.gd/wodefixewefuvuzelasa.pdf
    • http://sokurunofizune.rf.gd/qualcomm_atheros_bluetooth_driver_windows_10.pdf
    • http://wotadow.rf.gd/livro_pesquisa_bibliografica.pdf
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_97c15795ef674a17a2c9bfc0690bfa82.pdf?index=true
    • http://letibeboga.rf.gd/62899377730.pdf
    • http://fazavoregotula.rf.gd/temexumegukiverad.pdf
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_67d072af43824d038df20ccd92de9639.pdf?index=true
    • https://s3.amazonaws.com/wefemabeni/xedim.pdf
    • https://s3.amazonaws.com/dukajevo/how_to_apply_vinyl_decals_without_bubbles.pdf
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_6f64c2df57a14f0cb26aba6c9d60c397.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e926.bin
9dc1bc508e49a03aedd5b7866bf4c7c621e610016463e20ae0b48fba2e2d4424		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 9664 bytes
font_01_sfnt_off000109ac.bin
13eb49e976df41473988547cbf32b3605c83a3d446c424e77f3084af134c2b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 5092 bytes
font_02_sfnt_off00011b21.bin
505b7df0e479d2aafbc6ebfc85a5cc77b29f14e72cb9e8713cbfb09f4ca2637f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 11592 bytes

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