Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0ff98bb77fed04…

MALICIOUS

PDF

114.9 KB Created: 2021-02-24 16:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d87b9b7df0e581071d90c267ed480386 SHA-1: 20d18afb8701e6b8ae69cff0c71f37988e0df619 SHA-256: ed0ff98bb77fed044858f97d013e97e4f8a7599308fabe7785602dac7773700f
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body, though truncated, suggests a lure related to a book title, which is then used to disguise the malicious links.

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://yafferge.ru/strik?utm_term=como+orar+en+el+espiritu+libro+pdf In PDF document text
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/mekaduposase.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxeneson/iaiiJVy/rerudit.pdfIn PDF document text
    • https://pexasuwen.weebly.com/uploads/1/3/4/5/134593650/duzutavaro-zixakukuxofave.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463010/normal_5fecd3966d4b5.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/wexakaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_60120abc54383.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383467/normal_5fe4f0f10f8fa.pdfIn PDF document text
    • http://shortsomfj.space/96070422634afznc.pdfIn PDF document text
    • http://reduslim-europa.site/bengali_movie_sathi_2002_freermd7u.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxeromewime/ghrjjge/monster_energy_supercross_2_game_tips_ps4.pdfIn PDF document text
    • https://sejesomizibiji.weebly.com/uploads/1/3/5/3/135346687/kefumekudesamitu.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/djgB9gF/48532825475.pdfIn PDF document text
    • https://cdn.sqhk.co/powurejur/Jibgtgd/slendrina_must_die_the_school_full_gameplay.pdfIn PDF document text
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/buwokuxu.pdfIn PDF document text
    • https://saxuvelimeno.weebly.com/uploads/1/3/4/4/134480096/vegasexuves.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/7697593.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00018270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18270 5232 bytes
SHA-256: 846c84001b63053517bc922de105ccf33983133777d370ec59241b4e143d570d
font_01_sfnt_off00019413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19413 12912 bytes
SHA-256: cb79a348787cdafc40adf8e9cea95617434654b2e18c3390c8ede98e3621aa11

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