Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6c615a88e4d4e5…

MALICIOUS

PDF

67.6 KB Created: 2020-11-26 10:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: e92b5cddfdc935e43bd4c01190b8c9d5 SHA-1: b1f464a732c6bbb8dd01560afd666d43dd631fc2 SHA-256: 1a6c615a88e4d4e5d77a203e07bb34d5fca5bc11f125052121b7e68f194baae8
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=avantree+dg40s+driver PDF link annotation
    • https://kapokifi.weebly.com/uploads/1/3/4/5/134510442/7a1008.pdfIn PDF document text
    • https://jimakujomeda.weebly.com/uploads/1/3/4/4/134438408/zelaragodedutetu.pdfIn PDF document text
    • https://fobibopokigafo.weebly.com/uploads/1/3/4/7/134702456/3926086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f8dd706365c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f875fe9a0b01.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/leguvefu/38383135841.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/spiderman_future_foundation_suit_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02546c5d-ba59-431b-a29f-c1512311b601/30536148302.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/how_to_download_voot_app_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/43609967551.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/19332231026.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/endomorphisme_isomorphisme_automorphisme.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/non_school_blocked_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0907d54b-9146-44e5-abb3-514b8027f4b1/mevalodoramagitavixupex.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_off0000c986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 5240 bytes
SHA-256: 676bfe1b3e16f45dba50d5a6f84eed0d906ca12d407fd2e78292b50bfefde6f2
font_01_sfnt_off0000db72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 11352 bytes
SHA-256: f55f5a77f20bb768c1be3c7e70d8e8a3d8b9bc56ac5e083debab6364563a554e

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