Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a2b1813951616c…

MALICIOUS

PDF

96.2 KB Created: 2021-03-18 10:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9c28fb087fcb0597535ddd43c753670 SHA-1: a5554dd18e67d21154650721b952ba654d54723a SHA-256: e5a2b1813951616cfaab3799613166d7047b4a3bfa80993888225c99857a2566
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/123?utm_term=adobe+audition+3.+0+plugins+free
    • https://cdn.sqhk.co/tosuwukiwate/jDZmd7c/enchanted_fairy_princess_makeup.pdf
    • https://zijobezugol.weebly.com/uploads/1/3/2/6/132682913/f94a63dbf53e751.pdf
    • https://vijotuwotula.weebly.com/uploads/1/3/0/7/130775401/lebosuvix_vulosifinosi_jepejevora_zezafigurosudad.pdf
    • https://xabisemegebo.weebly.com/uploads/1/3/4/4/134491474/zezubugisaviradegu.pdf
    • https://fuzewero.weebly.com/uploads/1/3/4/3/134393775/wobozodelukatazut.pdf
    • https://milelujip.weebly.com/uploads/1/3/4/8/134861654/22203c45487.pdf
    • http://wusokamojifel.scienceontheweb.net/direccin_de_sanidad_polica_nacional.pdf
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/vewisatasulupinajegi.pdf
    • https://cdn.sqhk.co/ruvonusebex/yribQKa/how_to_loot_pin_pull_game_download.pdf
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/tubufed-lisanefi.pdf
    • https://nibonitet.weebly.com/uploads/1/3/0/7/130776737/9508570.pdf
    • https://vurejubi.weebly.com/uploads/1/3/1/4/131454114/lejix-jatotusuw-zamovemo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/luropiw/play_chess_against_computer_free_no.pdf
    • http://jotudokizer.onlinewebshop.net/6103270262.pdf
    • https://s3.amazonaws.com/tafogusegabomu/geotechnical_engineering_project_report.pdf
    • https://s3.amazonaws.com/bulolimepol/prime_and_composite_numbers_activity_sheets.pdf
    • https://s3.amazonaws.com/xijilesuzuxo/disosikulosawelomi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b1c.bin
0d0563a96df1319eb79cd8e2ea17cb494c3a076eb3559a18f069b7750de511a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 5556 bytes
font_01_sfnt_off00011e03.bin
7f38c7bd3076d5ec567b373f8788658f617417f44aeaffad1c2d563936ecbb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 2268 bytes
font_02_sfnt_off00012813.bin
73957cc9965e0111fa2392d78c74d22703bbeaab32be289a86365ae6f8dc6dc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 11740 bytes
font_03_sfnt_off00014ff6.bin
3dae81b76154e7c62b3b0d30507344c78f02ee9172d09a03fe7a9af96af9e849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF6 16116 bytes
font_04_sfnt_off000164d3.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164D3 4324 bytes

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