Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8af721c87cf2a7…

MALICIOUS

PDF

69.8 KB Created: 2021-04-10 05:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 64c1a0d296e9afecabae26f7e2e4111a SHA-1: c1ccfb07b65b4adcb1e95b384773324242ab3169 SHA-256: ca8af721c87cf2a746cdc8e93275485cbea2a7a8b2d3f8f821b40230930461b7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/strik?utm_term=storm+front+book+2 PDF link annotation
    • http://zitupow.medianewsonline.com/2d_animation_books.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/idjijhb/libuliwu.pdfIn PDF document text
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/6644174.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/71194662582.pdfIn PDF document text
    • https://cdn.sqhk.co/xozakatupab/TfohbL2/la_liste_rose_paroles.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/bumutif_metegugepaleno.pdfIn PDF document text
    • http://moshon.space/is_guns_germs_and_steel_still_relevant6kjep.pdfIn PDF document text
    • http://delinapod.mypressonline.com/24378922958.pdfIn PDF document text
    • http://regse.website/how_to_manually_install_usb_drivers_windows_8zluar.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/kcggggi/kitten_match_mod_apk_0._14._0.pdfIn PDF document text
    • https://kutolimog.weebly.com/uploads/1/3/4/4/134435461/rokovabenoregepovor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3002d381-f153-41d4-a9e8-389ced96ac76/why_is_my_phone_not_ringing_when_i_get_calls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e189504c-3d9e-4b49-bfac-2fb109a80037/how_to_read_payne_model_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13bf861-fec7-4d58-891d-56f2f9444031/hp_4500_incompatible_cartridge_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cabda0ad-95ce-4972-acd1-9dadc7d257ed/persona_4_golden_book_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a431765b-c34c-421d-b77e-346ccaf7452d/how_to_scale_a_figure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32cdac5-25f6-493f-b3b5-e55821c6d3bd/jufofiromajazukobizi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42F 4932 bytes
SHA-256: f74beaa279cbe98ba8b2da2a05e193d21af57cc366983299cdf4e21451a0f90f
font_01_sfnt_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 10968 bytes
SHA-256: 77ac43aeb0db85266b04cfe0083f943e806b3568356a704c8f84799c1f749570

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