Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7b0cd4da24d796…

MALICIOUS

PDF

94.9 KB Created: 2021-03-14 20:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92e11064764b8005bb8a91a7926cdaac SHA-1: daec2c8cff6cd89b7fcadf635f106c7cfd4ea2e1 SHA-256: 4c7b0cd4da24d79672dd325920ee8ea38f8db3916e670439e3a1d16f56c450da
156 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 links, with one prominent URL pointing to a site that appears to be part of a link farm designed to distribute SEO-optimized PDF files. The document body, though heavily obfuscated, suggests a lure related to downloading anime episodes, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://botokaw.ru/wix?keyword=download+raw+anime+episodes+free
    • http://magabof.22web.org/xijulijurol.pdf
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/24b9f2.pdf
    • https://saxetesaw.weebly.com/uploads/1/3/5/3/135301220/sujuri.pdf
    • https://paluwewokob.weebly.com/uploads/1/3/2/7/132712057/majiv_natobani_jemux.pdf
    • http://zobowuni.22web.org/reeds_naval_architecture_books_free_download.pdf
    • http://ruzoboxilotazex.22web.org/sakhi_songs_naa_songs_telugu.pdf
    • http://jofigapowewumaw.22web.org/candombl_da_bahia_roger_bastide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://puferug.rf.gd/le_califat_abbasside.pdf
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_c1218dea80e3435a9a9222b5eeded510.pdf?index=true
    • http://jojudodadanu.epizy.com/factory_code_for_my_sentry_safe.pdf
    • http://gizimup.epizy.com/linear_algebra_textbook_free.pdf
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_ac0c7dfcc6dc4426a6608d73e220d33f.pdf?index=true
    • http://lokemupuwife.rf.gd/cyrano_de_bergerac_playhouse_theatre_running_time.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/34304569043.pdf
    • http://muvotezazalad.epizy.com/59599880545.pdf
    • https://s3.amazonaws.com/nisiwanolom/kuccps_admission_letters_2019.pdf
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_42b561632b874ad7b8963642086dbd5a.pdf?index=true
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_3c43dd6ab7d842c985d9659aeb42e8fe.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_off00012d3a.bin
270f3bdfd5a7c0b0e4341ee7875b531d63647b97c423dced6a1a7e0b5860f85d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3A 4988 bytes
font_01_sfnt_off00013e1d.bin
36f93129752bf63253eb9842f015320a8d73c8289482f957a3517dd90468efe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1D 10144 bytes
font_02_sfnt_off0001604b.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1604B 4324 bytes

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