Malicious PDF — malware analysis report

Static analysis result for SHA-256 031c9e62a0201df7…

MALICIOUS

PDF

76.6 KB Created: 2021-04-28 09:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dfdf048692cd98a7d24cf2e6fcd9085f SHA-1: c5b788c45ccf27939c8186867092f038a86030e3 SHA-256: 031c9e62a0201df79d14baa70711be9ba0d203681f83a2421413f95836e3b31b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services and appear to be part of a link farm. The primary URL suggests a phishing lure related to PMP preparation. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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
  • 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.
  • 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://resalured.ru/strik?utm_term=how+much+time+is+required+for+pmp+preparation PDF link annotation
    • https://cdn.sqhk.co/vugasoveg/jgchfBW/15996798962.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/gh1javq/72360612401.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/pjdvQge/horror_skins_for_minecraft.pdfIn PDF document text
    • https://minuzivajod.weebly.com/uploads/1/3/4/3/134354575/wiguxarudarutoj.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/BjeghNo/pazatosagix.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/dmD9Zjj/truth_or_dare_netflix_2017_actors.pdfIn PDF document text
    • https://setuwome.weebly.com/uploads/1/3/0/8/130874340/mujobedexediw.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/jcOgeXD/king_herod_s_song_lyrics.pdfIn PDF document text
    • https://gakafapokizi.weebly.com/uploads/1/3/5/3/135319358/a47df9242.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/d32FgdR/superheroes_2048_game_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/uKghr6F/2796862895.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/jioJhfM/26558308873.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/01hasic/crew_app_customer_service.pdfIn PDF document text
    • https://javesobasi.weebly.com/uploads/1/3/4/7/134736097/0b2c66.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/jaRjahh/singing_machine_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/idhdChh/road_rage_epic_shooting_dallas.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/gfjg0QI/36119995232.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8baabb-08d3-44ec-b6fb-8518946b2ed3/36937423048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a9bd15b-1d17-465a-bed7-14d1659a1679/34712945866.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_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 5540 bytes
SHA-256: ca962d6b98eace7f64478887b7df3a90294e36622230bf266c386081109f0f2a
font_01_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 11124 bytes
SHA-256: 022deffb36df1458b3fa10bee1a8e59bc14d8cdc2dd2a14f48a88a178d4fc85c

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