Malicious PDF — malware analysis report

Static analysis result for SHA-256 381f0aeef9e0f43e…

MALICIOUS

PDF

74.6 KB Created: 2021-03-20 15:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 19caeadca405c1c98eb087c0bdb5c8e8 SHA-1: fa84d62105053900809d7ea517d01fe003c5ee2d SHA-256: 381f0aeef9e0f43ef356ed983b9bc27b0275c74a829eb8da43cca992648cc6c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xezojetit.ru/award?keyword=apush+textbook+16th+edition+pdf PDF link annotation
    • http://derifupiwa.mypressonline.com/bsp_thread_drill_size_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/hj5p1tl/bird_of_paradise.pdfIn PDF document text
    • http://dokaxirugik.medianewsonline.com/13935118507.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/the_peripheral_route_to_persuasion_define.pdfIn PDF document text
    • http://gaxenop.medianewsonline.com/68971678890.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/dasarotarigibido.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/cgffTjb/wood_carving_kit_menards.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/7jfgj6N/37652186303.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/3d900734-b8bb-48e1-ac44-27a7fa77a68c/38524812399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c77a9e0-1ba3-4ec1-9ba7-28af8c279bb9/where_can_i_find_the_dice_game_left_right_center.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/journeyman_plumber_resume_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63677d91-438b-4439-9b72-3ac193e043cb/womegotajofubojanav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02127295-7c30-4262-ace4-4be9c5ab95df/ludogisuripam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf42faeb-4c2a-442c-84d5-5bfc0aae90e8/mivilolotanen.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/tavovanulobazamugoremo.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/template_arvore_genealogica_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6e0b91-775b-4ab8-a7dc-1d1650ec8e8c/99903461600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0474192b-45db-4f1e-8c6d-4e007f5cfb58/larazoruzu.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/rigirirovagoponufezud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/972afd97-bd19-4790-ac5f-2caba2d68ca0/cunto_dinero_se_puede_llevar_en_avin_a_estados_unidos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4eef81d-576b-4683-aa52-9042c7562700/can_obstructive_sleep_apnea_be_reversed.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_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 5140 bytes
SHA-256: 229465cbde8c2eb6e824cdb58f6e418c633ce3a4e411b7fed8f59a23964b45d0
font_01_sfnt_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 10600 bytes
SHA-256: 77527de7c59f17bd4ae6ae79652fe92bd0123ee2dfffdf0f70f4d80d96903a31
font_02_sfnt_off00010cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176