Malicious PDF — malware analysis report

Static analysis result for SHA-256 34801195e73753ec…

MALICIOUS

PDF

47.3 KB Created: 2020-11-02 14:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2e08574c5b7686449cf65acb414d99e3 SHA-1: e33f159ad1cb23e0efeadfee8d119ae790c4b204 SHA-256: 34801195e73753ecb54c1f24fc059eab1855513b305ab04253bdc9fec751eb9a
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to a redirector URL, identified as malicious. The document body, though heavily obfuscated, contains the same redirector URL and other PDF links, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the presence of redirector links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?keyword=140.6+kg+to+lbs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f9c98d9cb6f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f8a60f8ef8ac.pdfIn PDF document text
    • https://jirunemopisitex.weebly.com/uploads/1/3/4/3/134332051/1675762.pdfIn PDF document text
    • https://zatetemaf.weebly.com/uploads/1/3/4/4/134494585/tedixesuzelusag-famusateti-punelanek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_5f9a6830d745c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_5f9c4d7622a16.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/ed65a9a.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/memul/89553938925.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/kijagoxodejotezifam.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/20419216414.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/71160280321.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/27108080837.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/67156442445.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/beowulf_old_english_with_translation.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B3 5124 bytes
SHA-256: a56b725f1bd07197c5ff97747e59cbfb7c23f1fe27aadfabc750d5085f1e52bb
font_01_sfnt_off00007650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7650 10484 bytes
SHA-256: c720f9e4e8ddc9d432809166400c16f5b724bfa4d8065dbaaefb7933328af380
font_02_sfnt_off00009a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A23 16320 bytes
SHA-256: fb893bf977bafd186a5cc07d78e9069310655ff3bb24730d8346491da1c337f9

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