Malicious PDF — malware analysis report

Static analysis result for SHA-256 3942ec7e742b8478…

MALICIOUS

PDF

70.6 KB Created: 2021-01-04 06:21:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: abc971b660789320d6c18662fbc3f26f SHA-1: 90556d633d9dfec2ec20c93337b3a43cbe680959 SHA-256: 3942ec7e742b847860a3c6e87cdd208c39b2547f70bd8ff4aed7e602820bc0d4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafficel.ru/123?utm_term=grim+soul+mod+apk+2.9.1 PDF link annotation
    • https://cdn.sqhk.co/birenejar/J1idje3/bajazupador.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/2ifAhde/81471792308.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/rwlzihi/kiwuzademoja.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/8920809.pdfIn PDF document text
    • https://cdn.sqhk.co/vidoperife/vLgheig/prison_escape_puzzle_walkthrough_level_4.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/T9p4Unc/kontra_k_freunde_genius.pdfIn PDF document text
    • https://cdn.sqhk.co/kokowoxiwi/413idmL/free_video_calling_apps_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/14hizDr/valhalla_viking_festival.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/Fjejjif/biziridazinot.pdfIn PDF document text
    • https://voduzivet.weebly.com/uploads/1/3/1/6/131607522/gugoxonufaget.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/d52503aa-0e3d-4e89-867a-09bdd4d7df81/ocd_annual_conference_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/bosch_series_6_washer_dryer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4ab822-2a83-4baa-9e11-a2def0af4af8/sapuxizotabuvofo.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/lobajopuworulikusexegirak.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/kepimapawuwaz.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_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 5572 bytes
SHA-256: e5ec4510541c38974f63333586b3f83f8f0e3308b1f9924f96e84a687e2482d8
font_01_sfnt_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 10656 bytes
SHA-256: d85aec96566939ae6657f4ad7d30b02883fc630e79a8afd77be01a51986aa407

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