Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d72abd9822ff02…

MALICIOUS

PDF

71.0 KB Created: 2021-02-21 04:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 793974807dbfa58408a2e68cf00956a3 SHA-1: dfef1983caaa6611ba503c0a05139f75d48e3ea7 SHA-256: a7d72abd9822ff0265e2d1673a3f776183da3c8576a4ebbab3874c9a6de0927b
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://yafferge.ru/123`. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including `https://cdn.sqhk.co/vefomatakin/jfgfZjg/moto_racing_15th_anniversary_2_mod_apk_download.pdf`. The ML classifier also flagged this PDF with high confidence. These indicators suggest the document's primary purpose is to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://yafferge.ru/123?utm_term=these+constellations+are+seen+in+the+northern+hemisphere In PDF document text
    • https://cdn.sqhk.co/vefomatakin/jfgfZjg/moto_racing_15th_anniversary_2_mod_apk_download.pdfIn PDF document text
    • https://bawufavipefal.weebly.com/uploads/1/3/0/7/130740211/7570252.pdfIn PDF document text
    • http://lolafoduluj.22web.org/columbia_river_fishing_report_august_2019.pdfIn PDF document text
    • http://fivogudog.iblogger.org/10_examples_of_social_media_platforms.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/fqhbhc3/yellow_light_on_iphone_while_talking.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ljggigj/legewi.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/mikuzivot.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/Kgihegc/w3schools_css_border_width.pdfIn PDF document text
    • https://zewurutivuzaned.weebly.com/uploads/1/3/4/8/134888434/gulafi.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/iqPajdm/49086134304.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/GghiYig/lotibolapobivutumoz.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/iSutjee/bullet_echo_hack_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fakupomajokiwe.rf.gd/sigurev.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_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 5124 bytes
SHA-256: c1d92c59da18c9e2fd0605a93fd9cd33cccc09ccd7cde699a7b1f6cfb52063d8
font_01_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 11032 bytes
SHA-256: 1473039c0f13fb8db14507b827c7253a08f1bc87340ee8c4abf327898aa7450d

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