Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d88fbe448e06d9…

MALICIOUS

PDF

80.5 KB Created: 2021-03-11 21:52:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: dd3bd02dc594c25c2c1183ef62ca69fd SHA-1: ef36163e5d9f32a9af956416dea7ba77bd1c3ef2 SHA-256: e4d88fbe448e06d97922719acc76785986add750d98759bdbe7b0b005271a421
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded links pointing to various domains, many of which are hosted on disposable or suspicious platforms. Heuristics indicate this is a link farm designed to redirect users to potentially malicious content, with specific rules flagging it as a suspicious link lure and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://nipisod.ru/award?keyword=ley+federal+de+austeridad+republicana+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/xakalodesi/1ghfhim/laposadurifegebimivulu.pdfIn PDF document text
    • https://nujokolove.weebly.com/uploads/1/3/0/8/130874035/6388882.pdfIn PDF document text
    • http://lukuvamaki.iblogger.org/what_kind_of_choke_does_a_stoeger_m3500_use.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/84a96.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/6ijEjjW/python_xml_formatter.pdfIn PDF document text
    • https://livabobuladezer.weebly.com/uploads/1/3/0/8/130874084/kedomebuk.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/ZgdCjfF/mibefujemaf.pdfIn PDF document text
    • http://lnstagram-support.live/how_to_use_digital_multimeter_in_tamilxepd8.pdfIn PDF document text
    • https://cdn.sqhk.co/fovudadeweto/ifgchit/maps_of_clash_of_clans_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/ghYsjfB/orange_ball_tennis_tournament.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/iiDhjhg/murder_mystery_game_roblox_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/gufuluzibos/fJPZhsY/75789811963.pdfIn PDF document text
    • http://vertigoa.online/5649665798267cdn.pdfIn PDF document text
    • https://cdn.sqhk.co/zajagatetode/ifDqSxX/pofugezelanagil.pdfIn PDF document text
    • http://teagreen.space/24781753123r3khc.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/fhjjghb/3763319104.pdfIn PDF document text
    • https://tixedasuke.weebly.com/uploads/1/3/5/9/135979549/3319866.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/jhi5ou4/knife_hit_wiki_fandom.pdfIn PDF document text
    • https://cdn.sqhk.co/genazeres/Aiamhcy/steel_weight_calculation_formula_free_download.pdfIn PDF document text
    • http://romeita.space/carryover_worksheet_line_24_1st_col4nh75.pdfIn PDF document text
    • https://cdn.sqhk.co/dojaxeje/eQlJjeh/jusosijadunuwuxavofodi.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/bSr0wjg/dosadageze.pdfIn PDF document text
    • http://sodalabs.club/7364007886uti8k.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/ghhqLgf/28679644976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamebunamol.rf.gd/rawozibijamuxupu.pdfIn PDF document text
    • http://lerapavuzuloz.epizy.com/67321115914.pdfIn PDF document text
    • http://sapifux.epizy.com/fodujujoxejokogekof.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_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 5608 bytes
SHA-256: 35ccd85408b1430776b3c29b554667cb376f54b2620e321fa74e45ec599105f4
font_01_sfnt_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 11504 bytes
SHA-256: a138ad69bfc8bfdc2857be5e89b4448b2c92e07df65e780ae762ebd89dbd81c1