Malicious PDF — malware analysis report

Static analysis result for SHA-256 0745c4aa27d43510…

MALICIOUS

PDF

93.6 KB Created: 2021-04-18 17:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1c036fb5069260de5fb718bee6dc0175 SHA-1: 7ffc0cb77a5caba87d1411b4d255823ff956beb4 SHA-256: 0745c4aa27d43510f145f99dfb4fe9f54dc234243251f708670207bb123f0023
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though malformed, contains text related to 'Google software engineers make', suggesting a lure to extract information or lead to malicious content. The presence of numerous links on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://dafemum.ru/strik?utm_term=how+much+money+do+google+software+engineers+make In PDF document text
    • https://timifuxi.weebly.com/uploads/1/3/4/6/134676324/tisul.pdfIn PDF document text
    • http://zarabotok.space/react_form_checkbox_valueey0dp.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/8369202.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/jliedjh/rasuwojizupubusabofigexok.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://bugilinupapud.mygamesonline.org/jotulezoduxazedif.pdfIn PDF document text
    • https://mupexopuwes.weebly.com/uploads/1/3/4/7/134722910/ab390d9a4.pdfIn PDF document text
    • http://kuviruvada.getenjoyment.net/skoda_rapid_rider_brochure.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/21d2e1295.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/TFidhgM/9809134169.pdfIn PDF document text
    • http://nefritthebestthing.site/81975993352tskoi.pdfIn PDF document text
    • https://topagolidokade.weebly.com/uploads/1/3/4/5/134502990/8163476.pdfIn PDF document text
    • http://chtotakoeverti.biz/english_grammar_corrector_online_freeygi6z.pdfIn PDF document text
    • http://helpcreditscore.info/kuxipibipowebelasonarxex5p.pdfIn PDF document text
    • http://urott-hu.com/gabaj0nddm.pdfIn PDF document text
    • http://prod-fruit.space/18399004136zcbpc.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/jP5jeX7/lep_s_world_2_game_mod_apk.pdfIn PDF document text
    • http://hayatevesigar.online/bogitora_2013_songsxczq.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/mozedijiz/figurative_language_worksheet_for_third_graders.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/49447577552.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/77809613851.pdfIn PDF document text
    • http://duwemanuwixam.atwebpages.com/tilezekonajumuz.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/nedimolujadabukibowisum.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_off00012de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE1 5652 bytes
SHA-256: 9234be15a953c3054d4b02381624d67b39c695ca38c2029a1ecf10b55f56d898
font_01_sfnt_off0001410d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410D 11568 bytes
SHA-256: c81d0eb675581098bfcf7df344d5acce6cd6560598f77fb39d4920d3b431665d

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