Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93901334d47c313…

MALICIOUS

PDF

77.9 KB Created: 2021-03-27 20:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 72621d50ff79dd95aa87999d567f6d96 SHA-1: b16f3676356a61399b261ef4e85c78e5b3ef494d SHA-256: b93901334d47c313d05b8d8c9dbb8181b2c44941e2254854893161202b2150e6
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=tell+me+about+yourself+interview+questions+answer PDF link annotation
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/6eb920ce9.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/verizon_fios_gateway_g1100_specs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_605aef9e88c51.pdfIn PDF document text
    • https://cdn.sqhk.co/felodunom/cgdhhHk/rowanerarifodesafo.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/Klrjjhc/pocket_door_installation_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/Ggegcjg/siren_head_creepy_video_call_challenge_prank.pdfIn PDF document text
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/wajilogugakegamemeke.pdfIn PDF document text
    • http://bijepitujutix.sportsontheweb.net/ti_nspire_cx_student_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ximirujusuxo/ige0moA/flick_kick_football_kickoff_paid.pdfIn PDF document text
    • https://tebixuku.weebly.com/uploads/1/3/4/5/134595315/b9406506af704c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5ff46d732726a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_604ccf2c513ee.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/all_function_in_excel_2020_with_example.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xasagode.myartsonline.com/tetevule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dec20d8f-693f-4aa5-b75a-f89c18c0c77d/tugiwukiwujalaxofol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff9d8ab-642c-4594-b67a-b66fb01b6828/strangers_in_their_own_land_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca73e89-44e1-4b5d-b4ff-a657bcaa658d/18731911427.pdfIn PDF document text
    • http://wufikemofumop.atwebpages.com/76023523496.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

Related samples 8

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_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 5380 bytes
SHA-256: 46295bd0276c2aebe26cf569631b8957e388a5f2df1b5da3af517f4612d67076
font_01_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 10544 bytes
SHA-256: e4d22df513faf3ff3b99392eafb086d48d0e5f7bd838697d757be8c684ca73e8

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