Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c48f016a8240e2…

MALICIOUS

PDF

69.5 KB Created: 2021-02-26 00:27:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 12264267e35ec8086fa25d27ccf8fc97 SHA-1: a4fde3179f2fad030330f87903fe406ba3c81fd2 SHA-256: 50c48f016a8240e2ccff4595cdaf0722e92f31ad3a11eeb75f36c8558c5a28ba
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, suggests a phishing or link-farming scheme designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing attack, likely using embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=john+deere+mower+parts+uk PDF link annotation
    • https://cdn.sqhk.co/bisidilit/5jfhjqR/narab.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/my_favorite_things_john_coltrane_counter_numbers.pdfIn PDF document text
    • http://parexapubep.iblogger.org/jutilexojusazuxu.pdfIn PDF document text
    • http://javebamugizal.66ghz.com/queen_size_solid_wood_platform_bed_frame.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/91710098668.pdfIn PDF document text
    • https://cdn.sqhk.co/gesimefav/pifhiih/60693231855.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/gfhehe4/weroxefunok.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/pizetelaxakozodemibasaga.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/jKhbt85/tricky_brains_1991_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/Hthckjj/24690712410.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/arduino_tutorial_tutorialspoint.pdfIn PDF document text
    • https://jixidaku.weebly.com/uploads/1/3/4/4/134495137/4662441.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/numunenoji/1963854046.pdfIn PDF document text
    • http://kopolug.myartsonline.com/how_to_fade_a_buzz_cut_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/74554240544.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/less_than_truckload_industry_report.pdfIn PDF document text
    • http://bovinow.epizy.com/hypertension_diagnosis_guidelines_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/affirmative_imperative_form.pdfIn PDF document text
    • http://rugapekazudi.epizy.com/chick_master_incubator_manual.pdfIn PDF document text
    • http://redufowoloware.rf.gd/what_are_the_top_universities_for_medicine.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_off0000d2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 5312 bytes
SHA-256: 3214939d9bde784ca207d3194ebd66ebcc261b21b6afdec8d3fc1cda6f256d8f
font_01_sfnt_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 10572 bytes
SHA-256: dba49dafa7301f789e97af282a135bd0dc3991f1381ca41c8b68e3b7400ffc5e

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