Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b34a7197789d4f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-25 10:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3700a7ae6b0f2b738285533b9abb105b SHA-1: 8db74a33ad6b817620c077085da1b964c7d36965 SHA-256: e4b34a7197789d4fb4b4ba616018b5ab01cae7ce82697c3eee6610122020bf50
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/123?utm_term=crossword+puzzles+answers+english PDF link annotation
    • https://kakexesasag.weebly.com/uploads/1/3/4/6/134614155/1368df75c.pdfIn PDF document text
    • https://mikuloxituxawe.weebly.com/uploads/1/3/1/4/131410747/nojura.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/what_color_of_blood_is_implantation_bleedingz8wx4.pdfIn PDF document text
    • http://trysoda.club/why_is_my_yeti_microphone_not_workingp3moe.pdfIn PDF document text
    • https://cdn.sqhk.co/pikuworano/htkgmhd/history_s_greatest_mysteries_release_date.pdfIn PDF document text
    • https://kitawusew.weebly.com/uploads/1/3/4/2/134234725/199b870a96.pdfIn PDF document text
    • http://visanekis.iblogger.org/zuroxajasobutebonazux.pdfIn PDF document text
    • https://kebokezuzak.weebly.com/uploads/1/3/5/3/135318209/109731.pdfIn PDF document text
    • https://wosuletoxo.weebly.com/uploads/1/3/0/7/130739711/vagedafezi_rifebob_jevulivesobos.pdfIn PDF document text
    • https://bewabolome.weebly.com/uploads/1/3/5/3/135347927/b68844079c7ca.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/cgfXAjb/treasure_hoarders_genshin_impact_farm_route.pdfIn PDF document text
    • https://feroraja.weebly.com/uploads/1/3/0/9/130969346/befep-sibifibutufo.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/jijdCig/cute_fashion_girl_drawing.pdfIn PDF document text
    • http://itchia.space/39849202361fk95c.pdfIn PDF document text
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/vadabikobujumo.pdfIn PDF document text
    • https://tetusujofejami.weebly.com/uploads/1/3/2/6/132695476/vumoxiz-pafabupudejixa-tolivexaduko-tawole.pdfIn PDF document text
    • http://repair-monokoles.ru/history_a_very_short_introduction_summary4eqpt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_cc3721fbcaec458b961e7930aed07fd4.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_a7a9cf65d0ad466cbd84bca3d660575a.pdf?index=trueIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_84bb3a88d2234ae9bc6a803bd1ae7b8e.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_ec2410fdd80e4706a0b31950eed39fc4.pdf?index=trueIn PDF document text
    • http://vipotunopadilez.rf.gd/tezunikiluw.pdfIn PDF document text
    • http://roxutudutupit.epizy.com/devukaxosepevuw.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_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 5268 bytes
SHA-256: ebfc21d62e540912cf879e534141436e8dda7eb2536fa3a15b8a32289692d80f
font_01_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 10688 bytes
SHA-256: 388080cf9b26dd74caee6315854fd00d0b7218f0a1e06ffb8d7db9bd868a4874