Malicious PDF — malware analysis report

Static analysis result for SHA-256 377a74a4e2fd7b06…

MALICIOUS

PDF

72.4 KB Created: 2021-02-15 20:37:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b8aacc0205750aa039906a51f29c3ed3 SHA-1: baac33a5d657d0662668530d3387b6be6e24f065 SHA-256: 377a74a4e2fd7b0666e654185b2cd5eef33c758e3d89b837047acda83db08194
262 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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
  • 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://crophysi.ru/wix?keyword=signing+naturally+units+1-6+answer+key+online In PDF document text
    • https://static.s123-cdn-static.com/uploads/4386839/normal_5fc70535aeb1e.pdfIn PDF document text
    • https://cdn.sqhk.co/lipidupi/hhirmia/lefilorakivibudarorivu.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/jbWicBV/forest_hd_live_wallpaper_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5fd1b8e652d48.pdfIn PDF document text
    • https://xadixolikiz.weebly.com/uploads/1/3/1/3/131380305/365b8d1.pdfIn PDF document text
    • https://podetixado.weebly.com/uploads/1/3/0/7/130739559/6c361838.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/Ve3jebD/63242029314.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/jeZ5Wcr/android_system_webview_won_t_update_pixel_3.pdfIn PDF document text
    • https://cdn.sqhk.co/zagusebipin/Vcd0W4C/fifobopuvifapopukemesifi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418184/normal_5fcd43b71b069.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/bOJAVie/wind_of_change_2d_platformer_arcade_game.pdfIn PDF document text
    • https://fugunukotuji.weebly.com/uploads/1/3/4/5/134589730/a5288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385214/normal_60076dc77d645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415525/normal_5fcbdcdba9c74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415518/normal_5fff97a239d8e.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/zafijukopa/cisco_jabber_user_guide_windows_7.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_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 5452 bytes
SHA-256: ba15abec357084cc25419099e473e28fe535ad18f681cffde46c6cc5aabd0fe8
font_01_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 13672 bytes
SHA-256: 9d4316dbd8177526d08b73d34143ddb6b597c8e448eab6013cb6a4deda3929a0