Malicious PDF — malware analysis report

Static analysis result for SHA-256 a281f776aad15f0b…

MALICIOUS

PDF

98.1 KB Created: 2021-05-22 00:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 28868266de0da5fc80257e5e16eda6b1 SHA-1: 638ecb1164cddccb2bbd00381cf2b23b6a048ebd SHA-256: a281f776aad15f0b7f18cf8ccda70541b4e4364dd8e351936bf773a332196d8a
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which point to redirectors designed for SEO and phishing lures. The primary malicious URL identified is a redirector that appears to be part of a link farm, likely leading to a phishing page. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://resalured.ru/strik?utm_term=andrew+sanders+storia+della+letteratura+inglese+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476302/normal_60402e508f174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_6026e4027a015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480588/normal_6063638f3b445.pdfIn PDF document text
    • https://lemuvizavo.weebly.com/uploads/1/3/2/6/132682731/9789575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455198/normal_5fd962699b8b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_6029c6b9ec792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475995/normal_6067a467aabaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426269/normal_5ffa6d8e5012b.pdfIn PDF document text
    • https://ludefexidox.weebly.com/uploads/1/3/4/3/134344451/88dd5f8b62.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/8988eb27-c790-42dc-a90f-6fa67e501f8e/39817397993.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/what_is_the_three_part_structure_of_the_book_of_acts.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/33073443367.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/watamamis.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/remington_electric_chainsaw_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ac527a-74cb-47aa-b10d-d2b5d91dfc5f/koxoxobagakasawe.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/71254293913.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E7 2180 bytes
SHA-256: bb183998ec68059d847e594b2ef15d4bc577cb4f2dec51ca893642e999d47ca4
font_01_sfnt_off00013de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE9 5288 bytes
SHA-256: 6ec28a535b4b408d14b4f62f4cc96a3a48fbfdd02f2b134113835380cd7b6c60
font_02_sfnt_off0001500a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500A 12552 bytes
SHA-256: 14b4e6f67a2c361841f448315b6ba016efa397caca996fbc7b872e573ce0ac82

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