Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73f8a0f54393710…

MALICIOUS

PDF

71.8 KB Created: 2021-05-27 23:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bd24eb5bea76682e87afc2256d1f7d96 SHA-1: df8140d583c986e3627c6c5f43bdfadb8602f6e9 SHA-256: e73f8a0f543937108e81fa2589fe06d8b5f93d695a8ece2e6254bfb9b025a8c0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=reported+speech+exercises+4+eso+pdf+resueltos PDF link annotation
    • https://morinuzarisifuf.weebly.com/uploads/1/3/4/2/134234593/webiker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5ff7fe4aaa9ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408463/normal_5fc9983e56e81.pdfIn PDF document text
    • https://tonukujile.weebly.com/uploads/1/3/1/8/131857071/34d34b46f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459929/normal_5ff5a971c8900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482190/normal_5fc7e54fd57df.pdfIn PDF document text
    • https://nuwebobejope.weebly.com/uploads/1/3/1/4/131407692/52e04025c1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_601a4af2bdf08.pdfIn PDF document text
    • https://jebopisozezir.weebly.com/uploads/1/3/0/7/130739828/lokaxugazomaxi_sejadu_pexenikemava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451206/normal_60366d6878d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_5fe890951bd16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_6039f621ddd17.pdfIn PDF document text
    • https://mapupuvegov.weebly.com/uploads/1/3/4/7/134712300/7b6e62.pdfIn PDF document text
    • https://gimeboxevamovuv.weebly.com/uploads/1/3/4/4/134494840/zuremileridowo.pdfIn PDF document text
    • https://wudemivezetuf.weebly.com/uploads/1/3/4/3/134318680/domoxubi_karoxexok_zibim_pemodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455194/normal_5ffd762183dc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444366/normal_5fe372e5e46ce.pdfIn PDF document text
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/nazomuvomi-radigitezar-lurunedufigabig.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/3462c4a9-2204-4a23-86a2-e1be79cc93cd/wilobebin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bb143c-29be-4171-ba31-bc2ee575226f/who_is_the_biggest_greek_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828a89ef-9b98-4a3e-99fb-a1a189f2bca1/59976511029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9471f1a2-dd1b-443e-8d9d-48bce04ff011/brother_hl-5250dn_printer_drum_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c9ab2e-c8be-435a-89a5-5a9d496b0f80/travel_the_world_on_exos_ladder_season_2_sub_espaol_ep_37.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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 5196 bytes
SHA-256: 7a7f5c0fcd005725c13b460847d41f86657ae8ad06082348cfe1369d2d898f5b
font_01_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 11516 bytes
SHA-256: 49298d728bd057111bf28c24e6dd9089238f0b178ce686a381843ce4973755b7

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