Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cfe5c4bd348918…

MALICIOUS

PDF

78.5 KB Created: 2021-03-25 06:35:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a368d5e0de2b950d48d798a500db27ea SHA-1: 059be1b8987ee58b54c6bd0c9d92428b5f1c67a7 SHA-256: 99cfe5c4bd34891813eaef0249736246fcaca19dc5f84d56475362c692975609
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'barcode scanning into excel spreadsheet' and 'wkhtmltopdf', suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=barcode+scanning+into+excel+spreadsheet PDF link annotation
    • http://wtia.space/we_make_the_road_by_walking_myles_horton_and_paulo_freire8xxcj.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/dehjlpw/coffin_dance_meme_music_code.pdfIn PDF document text
    • http://mulawejotili.iblogger.org/96562252384.pdfIn PDF document text
    • http://vizit.store/pakak0zxlx.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/idujhgc/retamutotenazi.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/49436945955.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/Gjhe6gf/mmx_hill_dash_best_level_for_coins.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/82388122930.pdfIn PDF document text
    • http://opensoda.pro/gebobolsh75h.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/idFgcic/snake_vs_block_power_game_download.pdfIn PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/sitazepoke.pdfIn PDF document text
    • http://dejivuxa.mygamesonline.org/90141689178.pdfIn PDF document text
    • http://civiliscmq.online/kubejamovibavomijaupsd.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxumisi/b1ojiaQ/86445482904.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c9c40d43-3c5a-44ba-bc15-fc0fa1582fa7/ssa_1099_example_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81aa5b24-d863-4a98-abdc-f586f2645766/4140281593.pdfIn PDF document text
    • http://juxudawalugevop.epizy.com/birthday_card_creator_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c4002a2-0da4-484c-84d3-a75083fc278c/medical_physiology_and_therapeutics_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/271fb930-fc2c-4e3c-9a23-c4da0d9c5b1a/rival_crock_pot_bbq_pit_instruction_manual.pdfIn PDF document text
    • http://welavozolin.rf.gd/81495803254.pdfIn PDF document text
    • http://lojixebaxademim.epizy.com/audio_video_converter_for_android_apk.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/b_l_theraja_free_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 5240 bytes
SHA-256: b73c1f499b284091327686f2fee5f1060bfe710fe8c7dc1f5133636765567636
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 10524 bytes
SHA-256: b40e7fbb0cd025b3c35adc8ea6279e39c98cc7b5ea1436887344b683c28c22ca
font_02_sfnt_off00011e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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