Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cd0b07abd7898c…

MALICIOUS

PDF

42.1 KB Created: 2020-11-07 02:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cb920ff1d614fe7859c905ad0a94f3f1 SHA-1: 405b0cbf7be30c332849ff96c6a97f9a443ce4a3 SHA-256: 03cd0b07abd7898c9fc351b2d9ba999692318b692f60ce5ed256217ed7cdcf20
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by an ML classifier as malicious. It contains a large number of external links, with a significant portion pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://trafffi.ru/aws?keyword=st+alban+roe+catholic+church+wildwood+mo, appears to be a primary entry point for this link farm.

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.
  • 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://trafffi.ru/aws?keyword=st+alban+roe+catholic+church+wildwood+mo PDF link annotation
    • https://kakezilek.weebly.com/uploads/1/3/4/4/134401463/1970279.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/bisixidusuvafa_raxezada_paxuterufap_rodokudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f91550f0ed22.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/6456941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_5f9ff18093538.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/5473886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://sidulemova.files.wordpress.com/2020/11/52104464324.pdfIn PDF document text
    • https://sebuwisawos.files.wordpress.com/2020/11/fipupojuretis.pdfIn PDF document text
    • https://rirosap.files.wordpress.com/2020/11/glidescope_avl_manual.pdfIn PDF document text
    • https://zegamidat.files.wordpress.com/2020/11/vufirejafozebavewixej.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/sagob.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4506 5220 bytes
SHA-256: 6c5f3a1af5f8faa68df0670a774f6f19dc0eb0aa4e07742c209eddf67c435395
font_01_sfnt_off00005695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5695 9860 bytes
SHA-256: bccffe6fc0b42c7a8f9e415c341d3a1b97784d92e0ca39f05bf0e4c58846932b
font_02_sfnt_off000077d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D5 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off00008d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D05 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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