Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb351f0bdea77e64…

MALICIOUS

PDF

76.4 KB Created: 2021-01-13 03:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 54b0ddb6a4bf89abaaa26d69add4b283 SHA-1: 9367b457221936db3de207881845db45528a3d82 SHA-256: bb351f0bdea77e64261dbb2e4c013a8668c556a19a7a69f3024b838c7c15c258
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure and potentially malicious content, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The presence of these link farms suggests an attempt to drive traffic to malicious sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

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
  • 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.
  • 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://cctraff.ru/123?utm_term=quetzalcoatl+fgo+cosplay In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5faf5d861617a.pdfIn PDF document text
    • https://jilanuma.weebly.com/uploads/1/3/4/5/134522828/5aefd6f3c.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/aWgjjej/8363006729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_5fd7f0343a9c4.pdfIn PDF document text
    • https://zijunuriv.weebly.com/uploads/1/3/4/8/134892089/2f2b5d965a70480.pdfIn PDF document text
    • https://site-1172798.mozfiles.com/files/1172798/sukulubonuli.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/BPprfhd/animal_mods_for_minecraft_pe_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/1d53yp9/cowboy_game_sirius_channel.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/iihijh2/original_arcade_games_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/jjDjjnz/rolemararavabinokikelu.pdfIn PDF document text
    • https://kawuwulaf.weebly.com/uploads/1/3/3/9/133987507/cf86d033.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/h5iegeC/cannonball_run_video_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/XEC7fB1/like_a_boss_trailer_cake.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/uhi3vgh/school_out_simulator_2.pdfIn PDF document text
    • https://wajatajosow.weebly.com/uploads/1/3/4/4/134487766/7307750.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/gmhf5ih/14120245079.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 2960 bytes
SHA-256: 4253ce374f546ed82c0b962bfad5e193173c5af7311640f7068ccdda2cb38311
font_01_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 5300 bytes
SHA-256: 3dca896fd3581ed84ffb4f7925e3ef71a93e6b69f5b32f79e974853bf22f7292
font_02_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 11660 bytes
SHA-256: 17e9df6053d02821b5cd780d665dd5d2de1105442d58837d6c7ff7164dd9656a

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