Malicious PDF — malware analysis report

Static analysis result for SHA-256 801664fc50198ace…

MALICIOUS

PDF

76.5 KB Created: 2021-04-15 20:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 64c65a53c382c3f8d93d796d49809ac3 SHA-1: cd757996d50103ad16095e1b09c3421954369e56 SHA-256: 801664fc50198ace1ad50293e9d01afcf402efa4e96e3dcc4f58060812dd4f8e
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URIs. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of multiple disposable hostnames and UTM parameters further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=what+are+mini+dv+tapes PDF link annotation
    • https://cdn.sqhk.co/kigakikijebo/dKSOgdE/lowajewirekiweju.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/67905922241.pdfIn PDF document text
    • http://prolac.ru/projected_cash_flow_template_free3338c.pdfIn PDF document text
    • https://cdn.sqhk.co/dowamagova/hicjige/fish_adventure_aquarium_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/hGiiibZ/suvebimazurawaku.pdfIn PDF document text
    • https://jetujipizi.weebly.com/uploads/1/3/0/8/130813705/34829.pdfIn PDF document text
    • https://vuxabodunufa.weebly.com/uploads/1/3/1/4/131407539/4349973.pdfIn PDF document text
    • https://rabusefikitane.weebly.com/uploads/1/3/5/3/135314736/4748016.pdfIn PDF document text
    • https://cdn.sqhk.co/nurofiwele/Tjhja99/pubunagopa.pdfIn PDF document text
    • https://pudupujaw.weebly.com/uploads/1/3/0/8/130813100/4898529.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/65315735422.pdfIn PDF document text
    • https://dudafizegananif.weebly.com/uploads/1/3/4/8/134864336/todewikem.pdfIn PDF document text
    • http://masito.space/the_dating_playbook_for_men._dow3njrl.pdfIn PDF document text
    • http://zedakobogesa.mypressonline.com/rearrange_pages_online_sejda.pdfIn PDF document text
    • https://zilonuxe.weebly.com/uploads/1/3/1/6/131637529/nupubaril-jogedipar-jofasefude-kegowet.pdfIn PDF document text
    • https://defosojuregoko.weebly.com/uploads/1/3/1/3/131383900/serevesume.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/hcbbRLT/jones.pdfIn PDF document text
    • http://tomogorman.com/66761424507wl58m.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/xegovojiz_zosogisix_zazokawepaze_robano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/74902618368.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/puppy_vaccination_record_card.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/how_to_change_the_clock_on_a_pioneer_deh-p5000ub.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/fedex_office_near_me_now.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/antivirus_kaspersky_total_security_2018.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_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 5240 bytes
SHA-256: d51fe077aedcd2a77787c8b7dc3a425edcf4b64200f8e7c085d47dc845ee8881
font_01_sfnt_off0000fe93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 11204 bytes
SHA-256: 3e5de92eb45260f932ceace9dae9b063fbadbfa396d8b464b665de3597329004