Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b08112d0bcef32…

MALICIOUS

PDF

68.1 KB Created: 2021-04-18 03:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00e21aecd4357ded50e296c5eefc373e SHA-1: 4448e801871bb82e9d0f4d6452e08a6e630ffed0 SHA-256: b8b08112d0bcef32cbaa5f38aa42e0be745d2ea6d29993dde892d0be589e5a79
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to various PDF files, including one at `https://s3.amazonaws.com/vavale/white_sheet_crossword_puzzle_clue.pdf`. The document body, though heavily obfuscated, contains text related to connecting a Honeywell thermostat and references the `wkhtmltopdf` tool, suggesting a lure. The presence of embedded URLs and a high ML classifier score further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://dafemum.ru/strik?utm_term=how+to+connect+my+honeywell+thermostat
    • https://cdn.sqhk.co/pofifarim/2igghgd/fefuxadiwusebit.pdf
    • https://cdn.sqhk.co/gabogivoxavi/hjfhgBy/80784660792.pdf
    • https://cdn.sqhk.co/zezaxemepe/giif0ha/77607612137.pdf
    • https://cdn.sqhk.co/lelabepena/jibjbD9/light_meter_camera_35mm.pdf
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/5749813.pdf
    • https://cdn.sqhk.co/nasubivapu/ghghid3/spellbinders_prizm_die_cutting_machine.pdf
    • https://zurukonovode.weebly.com/uploads/1/3/1/3/131379219/gevogipatuje_jokagumakanemu_kupamojujeda_pudapobimifati.pdf
    • https://sunapibabe.weebly.com/uploads/1/3/3/9/133999858/fafarinajoxuzapofad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vavale/white_sheet_crossword_puzzle_clue.pdf
    • https://s3.amazonaws.com/tozaduliwubega/antes_de_partir_livro.pdf
    • https://s3.amazonaws.com/povelenavuviw/kowanidivo.pdf
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_ce9f184843dd479cb9a5680a2b96e4cc.pdf?index=true
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_aaba53b43d284cae86af24be77f096ad.pdf?index=true
    • https://s3.amazonaws.com/nakuzafol/sscnwr_answer_key_2018.pdf
    • https://s3.amazonaws.com/werowibovezoje/luxelozesadomejibevum.pdf
    • https://s3.amazonaws.com/jazuravazaguz/1-_99_crafting_guide_osrs_profit.pdf
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_b47a1aaba2054c188f83a8e1b2b67e81.pdf?index=true
    • https://s3.amazonaws.com/bovenotojitowe/73066225341.pdf
    • https://s3.amazonaws.com/jadere/6852548408.pdf
    • https://s3.amazonaws.com/wovigebi/why_was_the_anglo_japanese_alliance_formed.pdf
    • https://s3.amazonaws.com/vebogotexaf/93846042595.pdf
    • https://s3.amazonaws.com/mogipegi/beden_kitle_indeksi_forml.pdf
    • https://s3.amazonaws.com/wesezuzuvalirik/65658109046.pdf
    • https://s3.amazonaws.com/welanisowari/mokojegadem.pdf
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_fea775b7847342529e64e1d366f03fac.pdf?index=true
    • https://s3.amazonaws.com/wavunot/41618200974.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_off0000cdcc.bin
0f3848cb0ca23a469f27a668d303c18bf7c4e4ec05293756d762a5cdffc2ca08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 5192 bytes
font_01_sfnt_off0000df5b.bin
f7ec8b40f2186c08c0c25f6789f819939de2b055c3752d2afa1d19f34677ebff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 9920 bytes

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