Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a3844a76993a30…

MALICIOUS

PDF

69.4 KB Created: 2021-04-01 09:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 399193f273ed8628f99f9f0c7a685d46 SHA-1: cf02a2145535925fe43b6ec843beee9bb37726ee SHA-256: d8a3844a76993a30150f36c63f6e7dccc31f65ebd6f05366a3f116bf52240460
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier strongly indicates maliciousness. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://baarspo.ru/wix?keyword=fuji+absolute+2.0+le PDF link annotation
    • http://tranquils.space/tinyumbrella_64bithxkzb.pdfIn PDF document text
    • http://conicppjry.bid/budots_dance_song_freeequf7.pdfIn PDF document text
    • http://detonic-hypertonie.website/kutulajamusuxakiruleja6x6rk.pdfIn PDF document text
    • http://community-day.ru/443883435165fs52.pdfIn PDF document text
    • http://mrshadow.net/what_to_do_with_flamethrower_in_little_alchemygglfm.pdfIn PDF document text
    • http://amst-watch-v2.club/hero_xpulse_200_rate_in_nepal87q99.pdfIn PDF document text
    • https://cdn.sqhk.co/luzigagoguna/Qighigi/soul_music_radio_stations_usa.pdfIn PDF document text
    • http://megalit-korolev.ru/468817199184sa2y.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/gjYkb0C/assembly_line_production_definition_aphg.pdfIn PDF document text
    • http://jushq.pro/2429940852vrohb.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/jbgjMjj/hd_blur_background_for_editing.pdfIn PDF document text
    • http://how2clever.com/gafaripuwajimi7ahoo.pdfIn PDF document text
    • http://mixed-rootwork.com/ziweguzokudonujezube6acwt.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/a34c5fc8-28c2-42ec-80bb-c37a832c4e8f/genie_pro_max_2_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/58279158689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/550d2b40-f6a1-4ce2-9dec-8fd39336f0a4/77382716094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d2e0a4-c45d-47f3-9ea7-709120b0c19e/95350755259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7d41d4-a0bc-4918-bb7a-fcf1a9bc056e/49569634092.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/ramogirovipurovesojo.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_off0000d56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 5060 bytes
SHA-256: 2bd0390878cf463b3c8aa4094b12c70defa0bcdfe546464916cd5221427044c0
font_01_sfnt_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 10228 bytes
SHA-256: 392a989e1f75a73472a6358f9f515b280a4fb4ce99a6e99fbe1e655fb7197379

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