Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4e393e0b053e65…

MALICIOUS

PDF

80.8 KB Created: 2021-04-07 01:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8476c4bf4bbb2221bdca6c3674647edb SHA-1: be899ca91c6366e01ae2066f9bf7a37cfd540873 SHA-256: ee4e393e0b053e65d015da1c63e44590ef9c16ae892f317c193e514afd4aed61
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 services, and one primary malicious URL disguised as a firmware update. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/strik?utm_term=dcs-930+lb+firmware+update PDF link annotation
    • https://kadukutinebi.weebly.com/uploads/1/3/4/7/134747046/7440108.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/lhhggjj/barber_shop_cutting_capes.pdfIn PDF document text
    • https://kawowubizi.weebly.com/uploads/1/3/4/8/134864460/9066557.pdfIn PDF document text
    • https://wajativakol.weebly.com/uploads/1/3/4/7/134749030/1123943.pdfIn PDF document text
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/6702524.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/ibijiiO/extra_driver_dollar_rental_car.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/biZhji4/world_war_2_facts_list.pdfIn PDF document text
    • https://sixevajerav.weebly.com/uploads/1/3/5/3/135341720/6306500.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/e8lCie5/st_louis_county_recorder_of_deeds_mn.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/XFijyiC/carx_drift_racing_mod_apk_old_version.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/OihijmU/55918724460.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/figgfia/twitter_followers_real_time.pdfIn PDF document text
    • https://ragajepegoxi.weebly.com/uploads/1/3/1/3/131379061/josuzixivozu_botetumat.pdfIn PDF document text
    • https://gigadejelurare.weebly.com/uploads/1/3/0/8/130874533/7fda2f02ed.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/7290929.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vetamedisoz/kuxevopapofisavugekipodod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996c7e8a-3164-49f3-bcc9-82d24995c559/insinkerator_pro_750_lowes.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/19174726943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d698ace4-2354-4448-880f-d3e1e0b544ed/roxewemosadawovosoz.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/tabla_periodica_de_los_elementos_metales_alcalinos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a6ae8e-ebe5-4a44-b2ba-b3f64d217ed8/bosidasovolo.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/leave_letter_format_for_college.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b005f21-79e4-413a-8b2b-34a228fa1ddf/70382868322.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/formal_email_requesting_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6991687-dffc-4958-ad5b-d4798332f6a6/ps_vita_price_ebay.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 5692 bytes
SHA-256: d985560e8eba7eb96455f64317aa433cab84373a5ffa43417f5ad49aacbaf313
font_01_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 11152 bytes
SHA-256: 9558d95bba146a8dcc717dce9cc735ad2d89ae49151a622a84a34b4c116e1878
font_02_sfnt_off000125f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3