Malicious PDF — malware analysis report

Static analysis result for SHA-256 1267070808ccf378…

MALICIOUS

PDF

74.0 KB Created: 2021-03-03 18:31:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 71877a57999e960a4e295c9051fc5511 SHA-1: 59c8b65ced6293c3510cecb1a2a7df6632b4d7e1 SHA-256: 1267070808ccf37817725654f59d2bed45b9215f57d9cd9e9fee3eae33e8097f
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and are associated with known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'helter skelter book synopsis' and 'wkhtmltopdf', suggesting a lure to trick users into clicking malicious links. The presence of multiple link farms on disposable hosting further supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=helter+skelter+book+synopsis In PDF document text
    • http://xilexevu.scienceontheweb.net/describe_the_life_of_a_peasant_farmers_unskilled_laborers_in_the_middle_ages.pdfIn PDF document text
    • http://vosalax.22web.org/how_to_tell_if_oil_furnace_ignitor_is_bad.pdfIn PDF document text
    • http://juluzenaluziwo.22web.org/case_reports_in_gastroenterology_journal_impact_factor.pdfIn PDF document text
    • http://zomesotemaxage.66ghz.com/6th_class_english_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_602a38610b31d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_601283b74819d.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/fajixe/central_machinery_drill_press_43389_parts.pdfIn PDF document text
    • http://zapofekeba.rf.gd/ariston_hotpoint_manual_de_utilizare.pdfIn PDF document text
    • http://kisidop.rf.gd/98282558269.pdfIn PDF document text
    • http://tujemagus.epizy.com/5840924568.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/zeruviputerakutuvavu.pdfIn PDF document text
    • http://gutefidinasat.rf.gd/lijelegudal.pdfIn PDF document text
    • http://joriboka.epizy.com/dazuwejapuruzututoso.pdfIn PDF document text
    • http://tewidunutazi.rf.gd/meal_plan_for_bulking.pdfIn PDF document text
    • http://virilos.epizy.com/audio_money_mp4_free.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_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 4868 bytes
SHA-256: 62fd2390ff602201fa9ca239c3b60a88888e205d3305c7e04da1253e4c2f9ae3
font_01_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 10136 bytes
SHA-256: ef3324da6bc54c37b57aea52678ad8beaa3a53b031e4f4e990721c941845a847

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