Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc01242e44dd28ad…

MALICIOUS

PDF

39.1 KB Created: 2020-11-09 17:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 94ca8f62455f1ae634aa6841d1c7ddfc SHA-1: b804b6c28d15c991d38edfe5440622a1909f09b8 SHA-256: bc01242e44dd28ad4436e79c9b717584890963b867e5d8eaa360baf187a06cf8
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to a link farm hosted on weebly.com, designed to redirect users to potentially malicious content. The document body and embedded links suggest a lure related to 'Bulldog for sale in montana', likely a phishing or scam attempt. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/aws?keyword=bulldog+for+sale+in+montana PDF link annotation
    • https://rirejanumaxix.weebly.com/uploads/1/3/4/6/134631236/pekufotodix.pdfIn PDF document text
    • https://lerexujirizafet.weebly.com/uploads/1/3/4/3/134344290/55da1be0ba1f2.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/mijupomujid.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/6062171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_5f9f1433609d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/potevip/15386360334.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/composite_grades_pros_cons.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/xupugevoxoduvifof.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/rex_84_program_declassified.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/macbeth_summary_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/soxukowotomaj/gewudasinudididaxefam.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_off000057c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57C6 5276 bytes
SHA-256: 8f517d2d07dd67fef2ba2cf693aae5de8ecdf4b21dd73efb5939ef37647fdd43
font_01_sfnt_off000069a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69A6 11336 bytes
SHA-256: 7026d30fd44339255540a925c401330004ff5e95856db05aa4ceebc661a54097

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