Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddc32250716e445…

MALICIOUS

PDF

82.1 KB Created: 2020-12-26 03:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2d113aa0835deb66ab8745195bd70a64 SHA-1: bc4d87607af8883dde0d444d8e4329f359ec40af SHA-256: 8ddc32250716e44599636f561103e6ace8ade9bfcfba4d0e7bfa39eef1338906
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on link farm sites, suggesting a phishing or SEO spam campaign. The primary URL, 'https://traffset.ru/strik?utm_term=spanish+for+anysoftkeyboard+apk', is likely a landing page designed to deceive users. While no scripts were explicitly extracted, the PDF structure and extensive link farm activity are indicative of malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=spanish+for+anysoftkeyboard+apk PDF link annotation
    • https://dugezuwodovapa.weebly.com/uploads/1/3/0/8/130874298/2717857.pdfIn PDF document text
    • https://pimedoxeniku.weebly.com/uploads/1/3/4/6/134640330/5626911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f8939259050d.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/geRgclR/71806276406.pdfIn PDF document text
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/12512a.pdfIn PDF document text
    • https://cdn.sqhk.co/titolegun/hbjh7hf/layton_brothers_mystery_room_case_2.pdfIn PDF document text
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/2494916.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/VXghpgj/black_wolves_hd_wallpapers.pdfIn PDF document text
    • https://cdn.sqhk.co/muxizupemof/2gejeX7/faerie_dragon_pet_wow_classic.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/wNShdig/tokeziforakufobi.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/hiAharF/movie_maker_online_g_video_editor.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/d065cd09-f55a-4792-b6dd-d99bf591cea1/89468429156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9497ae90-a063-462c-9c59-dfd9254b9a89/48178675859.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010d13.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D13 25044 bytes
SHA-256: 91b1a86907bdb96a3f541f5d4b350defd2d85a034405dfc10340667af3e449bc
font_00_sfnt_off0000d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 5508 bytes
SHA-256: cec041ead5b927f76d297a365c243d88ef1cc3ee6460fe9d76c594dc354fa1e3
font_01_sfnt_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 11932 bytes
SHA-256: 81cc16f987f2af8a1482be4c66a29bcdc601b5199265106ea722165a89858711

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