Malicious PDF — malware analysis report

Static analysis result for SHA-256 505691cb2463d71e…

MALICIOUS

PDF

75.5 KB Created: 2021-04-05 19:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6d8ab8e171d3531931f42bd131ec5314 SHA-1: 2f5ce8798af067b9a34dee1ecd62b5491a71ebc0 SHA-256: 505691cb2463d71e801794c3ec26348b153ef7fb63313726611bd81cae24bd43
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://nipisod.ru/123?utm_term=factoring+large+numbers+worksheet PDF link annotation
    • https://kisagisetiduke.weebly.com/uploads/1/3/4/7/134762251/4525675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5fd042bd55d7f.pdfIn PDF document text
    • https://fobanuvoba.weebly.com/uploads/1/3/1/6/131637247/jelete.pdfIn PDF document text
    • https://rikafikisejale.weebly.com/uploads/1/3/0/7/130740062/marudipife_reliwisow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_6050707758463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452595/normal_6038629b62437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_604f4fdade151.pdfIn PDF document text
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/b4dfa6563bb64ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367903/normal_5ff64e2bd6cfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413019/normal_5fc8c6f884b3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5fd9495e3c1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_60533113e42e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_601e6f0898dcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bowumulupilad.epizy.com/96431184640.pdfIn PDF document text
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_be0b708b94284c738ae690b0a7f2fe81.pdf?index=trueIn PDF document text
    • http://sanebofav.epizy.com/agonista_e_antagonista.pdfIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_9c48e86a316c491aa494cda25802e52f.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_55710868280c4cb5b180177a8131243e.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 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_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 5464 bytes
SHA-256: 2ecadd32a9bb8e339dfc48703bda494852cd1fc67d18cc36df1c92255f4e19ae
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 11088 bytes
SHA-256: b7c2629ca1b060e4947e485e5cbfde938b77320ed819c25b6d8187049cb1dfb2

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