Malicious PDF — malware analysis report

Static analysis result for SHA-256 891607690ad25b38…

MALICIOUS

PDF

74.0 KB Created: 2021-03-14 14:02:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3e2c2e1d613ef7821986232b27374569 SHA-1: 9974807c807969b804ddfc4dbd79fe6e78f60335 SHA-256: 891607690ad25b3816beed6216e37e3aef9de685f02dcfd7009574ec146d198c
186 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. 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
  • 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.
  • 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://zajinet.ru/strik?utm_term=how+to+calculate+the+value+of+a+used+car PDF link annotation
    • https://cdn.sqhk.co/popuzanuguw/NVRQheL/97786462588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471945/normal_6029fc3f12780.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/jhhbsg4/sonic_the_hedgehog_wallpaper_cave.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/ayFbiju/baby_alive_grow_up_doll_accessories.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502563/normal_600aad2bbd96f.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/gex8Fgd/small_green_pumpkin_squash.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_e944e044aeac4a31918fba7954d5f5c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6af59a4-a237-474f-bb67-6f0c34a59cb6/jivuzatarun.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/brightness_driver_for_windows_8._1.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_0016dad2b6564169b6811cb806aac2ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/altronix_pd8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d934d5f-d49c-4f6d-87da-4c782d085abb/5681782395.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_fd0edbcbf80a4b0687de7ef757e563b9.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_1ee895bb0d674557bd8d3bcaf87b7a3d.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_7e8723c251a04759a0bc7554adfa9921.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/pebesujexulojidedixozuxub.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_795850d1ae8742ba861c90873a1559be.pdf?index=trueIn 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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 5224 bytes
SHA-256: ecab06b16aae87eed31758a7bb14a018915f21d546199e370b37914011dd08c7
font_01_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 10752 bytes
SHA-256: dfe9cf641a3ab35c8aabef0de6cb481b17fe2424b1f526f03a779d52f4337015

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