Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf18972fc262490…

MALICIOUS

PDF

74.1 KB Created: 2021-03-04 11:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 098e06e7aa4935c7320c90725e2f1337 SHA-1: fed7d6b49fd4292f4bfd0952afb13224d733a65c SHA-256: eaf18972fc262490f57497cfd2c38b226fa0c1e24b1bffe40112ef3af4e2314e
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://crophysi.ru/strik?utm_term=dough+bait+for+saltwater+fishing PDF link annotation
    • http://delinapod.mypressonline.com/hp_elitedesk_800_g1_mt_desktop_pc_power_supply.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/nixojemixi_wulimo.pdfIn PDF document text
    • https://cdn.sqhk.co/feledigowud/jdrH8Qq/rebuilding_center_portland_donations.pdfIn PDF document text
    • https://xovokemopozok.weebly.com/uploads/1/3/4/5/134579322/vagatolefezikip.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/hfijchi/evacuated_solar_tubes_price.pdfIn PDF document text
    • https://fevonijapa.weebly.com/uploads/1/3/4/2/134234837/petunilitazujarobuw.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/y6x0cjj/past_present_future_tense_verb_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_6024ccd150227.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/dorobukasawituw/risikol.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/pudasedofowozozomive.pdfIn PDF document text
    • http://wevevaviz.epizy.com/mibiwakug.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/alesis_hr-_16_manual.pdfIn PDF document text
    • http://kazaxese.epizy.com/12530848278.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/final_fantasy_8_ps4_trophy_guide.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_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 5260 bytes
SHA-256: ac19c413c9b5caf3b834a8438d7133db4521e85849b96b560660dbdf76143349
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 10748 bytes
SHA-256: c172c71d30e4c9a372d9399860200c36d78e5294861f00ecd114dc4562fee508

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