Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e19b396957633e…

MALICIOUS

PDF

78.6 KB Created: 2021-03-31 05:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 92ea154a03f289e9b9abf3224c6af34f SHA-1: 0de2f9e44515974984d235728db2c7cf093903ee SHA-256: 64e19b396957633e72fd9c639c500797ee41b10850fb243ccc6c44babba235ea
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery mechanism.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=esthetician+resume+pdf In PDF document text
    • http://kind-insta.site/onedrive_apk_uptodown415pt.pdfIn PDF document text
    • https://mopokelam.weebly.com/uploads/1/3/5/3/135349304/4863480.pdfIn PDF document text
    • https://worudunomazife.weebly.com/uploads/1/3/1/4/131483266/427d94e.pdfIn PDF document text
    • http://frut-tree.site/sedarnha1m.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/jgicSjb/49396899500.pdfIn PDF document text
    • https://nowujokawaj.weebly.com/uploads/1/3/4/6/134676947/1faf53b.pdfIn PDF document text
    • http://avtoshkola-region26.ru/tawutivowukavejaxodojopidjf8p.pdfIn PDF document text
    • http://gooddevice-online.com/dagasunuvevoc86z6.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/kghjagh/complete_book_of_world_war_2_combat_aircraft.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/iGO4fgc/crowdstrike_stock_next_earnings_date.pdfIn PDF document text
    • http://toppiksnack.xyz/losibapajerufonaxiqi99f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_1c900d50f54b4d108653fcf26c22306b.pdf?index=trueIn PDF document text
    • https://c208ddc4-37ec-4cef-823d-79aeaa8cd68a.filesusr.com/ugd/d34c4d_ad8d28deacae4f148550d54c8806707a.pdf?index=trueIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_0b451c6d070d49d488927734ae8c78f3.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_21e8594f9bf54563b18409df2ee8568d.pdf?index=trueIn PDF document text
    • http://jufowepazo.rf.gd/dungeons_and_dragons_5e_stories.pdfIn PDF document text
    • http://molugafew.epizy.com/3d_wallpapers_for_android_mobile_free.pdfIn PDF document text
    • http://xazulagevam.rf.gd/football_manager_2016_editor_data_download.pdfIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_17b3eab3e7574e0baf85b69f7388d76c.pdf?index=trueIn 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_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 5320 bytes
SHA-256: 03698fabdf950ff67a790c88ad69fcfff2ea43a7a866584c90b31ef01b2d7925
font_01_sfnt_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 11032 bytes
SHA-256: e493054fc8ca89781e19ae49952a0a86ed3c9c08ea1aef9662805b842bcee645

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