Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2779ef91bced6f1…

MALICIOUS

PDF

76.7 KB Created: 2021-01-15 01:24:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 10c56d998486bd8d7911de5789efc736 SHA-1: b96b849bd1c2b6e900415dc86f7e7851983c61b4 SHA-256: a2779ef91bced6f17b27f5b4223c77c76d6cc03fa79f3b1cfa2d18a11fc2f47f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files hosted on various domains, many of which appear to be disposable. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The presence of a critical heuristic firing for a malicious redirector link further supports this assessment. No scripts were extracted, and the document body was unreadable.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?utm_term=diecast+muscle+cars+usa In PDF document text
    • https://cdn.sqhk.co/gobuwovuv/htmApgi/65058990923.pdfIn PDF document text
    • https://site-1235942.mozfiles.com/files/1235942/descendants_2015_sub_indo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387921/normal_5ff480b995796.pdfIn PDF document text
    • https://vusowixaxepuw.weebly.com/uploads/1/3/1/3/131381533/wupetorabozapag_wibiragunob_mogumimerovep_toviniwox.pdfIn PDF document text
    • https://nixejovebomir.weebly.com/uploads/1/3/1/3/131380485/mukixomot.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/Op12ege/chargepoint_sbe_merger_date.pdfIn PDF document text
    • https://site-1174586.mozfiles.com/files/1174586/rose_flower_hd_pics_free.pdfIn PDF document text
    • https://site-1178227.mozfiles.com/files/1178227/grasp_the_galaxy_solar_system_wallpaper.pdfIn PDF document text
    • https://site-1176205.mozfiles.com/files/1176205/blomberg_integrated_dishwasher_manual.pdfIn PDF document text
    • https://subozabi.weebly.com/uploads/1/3/2/7/132710736/170944.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/5471698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_5fa357f98f6b9.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/9766258.pdfIn PDF document text
    • https://site-1166703.mozfiles.com/files/1166703/husqvarna_chainsaw_manual_240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_5fe929dff0293.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 4944 bytes
SHA-256: 12e075777f8298aa5f32d9000470bf0130cf935f8e099c87ca04b4df2046a0c9
font_01_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 10592 bytes
SHA-256: 70411e9b41a0411294fb2e8ad28c7053ed672b3db1a7353cce8de0cefdbc63a8

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