Malicious PDF — malware analysis report

Static analysis result for SHA-256 89900c81f8877fdf…

MALICIOUS

PDF

72.4 KB Created: 2021-02-27 11:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bb55286e8a8a6065731522d1bbb0dd29 SHA-1: a6886f2da7e78bded7d5b41cd9cf44cb26987d18 SHA-256: 89900c81f8877fdf1cb3e0b43ca56b9d8de78d913dba3912533d1155a589d632
166 Risk Score

Malware Insights

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

This PDF file was flagged by multiple high-severity heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. It contains numerous embedded URLs, several of which point to suspicious or disposable domains, and one is explicitly noted as an invisible link lure. The primary attack pattern involves directing users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://mezovuduw.ru/strik?utm_term=comcast+cable+box+rental+rates PDF link annotation
    • http://cleaner360.shop/georgia_dnr_harvest_reportx93jp.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/hbvWmhd/zogedemalesikuva.pdfIn PDF document text
    • https://wapaberupuz.weebly.com/uploads/1/3/5/3/135397773/37a9907045.pdfIn PDF document text
    • http://begemotiks.fun/google_chrome_android_hide_status_bar3xse4.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/rirumivi8n2.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/ii2giif/25599844454.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/jKbhggh/calla_lily_plant_care_outdoors.pdfIn PDF document text
    • http://secureappeal.com/lilitasijisoragener4trx.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/comparing_negative_and_positive_numbers_worksheetwzapd.pdfIn PDF document text
    • http://micrometerdigital.xyz/49669143620bewu6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xavitemis.rf.gd/brts_surat_full_form.pdfIn PDF document text
    • http://wapinogure.epizy.com/4992427242.pdfIn PDF document text
    • http://rebikesumusosu.rf.gd/dekarerazarakalilukipo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 5056 bytes
SHA-256: c57dbea5f6ab56a71caba41ef59249a4b9ba9ed24aabe651a97a4c76e8840b68
font_01_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 10280 bytes
SHA-256: 88f0a53d570209c083247071aa704125fe1ad01927d6978bf0b2501fcc99791f

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