Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d21aca87e8a255…

MALICIOUS

PDF

68.5 KB Created: 2020-12-04 22:25:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d0dab05a3abd61fa3f35c636ff747574 SHA-1: 96943408ab057268231db82ab5c954ef9541e1d7 SHA-256: c2d21aca87e8a2555b8e8c22f05128262c5f829f303f3d634ebd17371bdb1c59
222 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://gettraff.ru/strik?utm_term=terrarium+apk+download In PDF document text
    • https://tiralilibixadu.weebly.com/uploads/1/3/4/5/134500138/6ab606a282b0f1d.pdfIn PDF document text
    • https://raxitiladiruwek.weebly.com/uploads/1/3/4/4/134487911/vijufijonifuxej.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/bepukuba/bacillus_anthracis.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/vedumilulupumunotu.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/76424889906.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/project_delivery_practice_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7aa2bfc603311fbfbb6f3/t/5fc9fca41a258d244fe33392/1607072933002/vr_roller_coaster_game_online.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/37910667392.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/jegorunofovemepafab.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/banting_recipes_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b21741a7-96b4-4f02-bc47-10dd57e076dc/restaurant_logos_level_81.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/recipe_costing_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/mumebi.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/woxegatixuduju.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/iptv_pro_apk_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/chota_chota_peg_song_lyrics.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_off0000d09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09E 5032 bytes
SHA-256: 4617481d24726d8b46c4d29c3aec9213f9e714cf5d00c11058445070a1bd731f
font_01_sfnt_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 10348 bytes
SHA-256: 23db5d8263de7d382a40955bde5ed7dbe16afd75e20ffeda15048518e097c2ae

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