Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d90cde566ce03a…

MALICIOUS

PDF

68.4 KB Created: 2021-03-15 23:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4365da3b5b1897408bab403658c67f70 SHA-1: b072480cdbc47d51dcebea123094d9c465b0af24 SHA-256: 06d90cde566ce03aecf51a0dc40453b2227b64a694201d20b16d465d3d2aaafb
134 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing a large number of external links, many pointing to disposable hosting services. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. While no scripts were directly extracted, the PDF structure itself is being leveraged to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://midufefew.ru/wix?keyword=flywheel+sunnyvale+cancellation+policy PDF link annotation
    • https://cdn.sqhk.co/libegavezu/4Pihhfo/6011796747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5fd6dab8dd8aa.pdfIn PDF document text
    • https://nupanirosum.weebly.com/uploads/1/3/4/8/134858368/2319201.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376870/normal_5fcc70bcacfe7.pdfIn PDF document text
    • https://dosukasexu.weebly.com/uploads/1/3/1/6/131637789/5877101.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/ggckhgS/mod_morph_minecraft_pe_1._16.pdfIn PDF document text
    • https://cdn.sqhk.co/dilujuzaga/j1oigG4/53744590308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455174/normal_604e123f6dd1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409239/normal_5fe4f59b79594.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/YEhjFtx/lamomazenogazaxopexil.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/5839992.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383137/normal_5fc6c90b5fc5b.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/worusi.pdfIn PDF document text
    • https://cdn.sqhk.co/dukasavubu/giyhh4c/holy_roman_empire_timeline_maps.pdfIn PDF document text
    • https://sixumegeb.weebly.com/uploads/1/3/4/4/134476160/5152a85.pdfIn PDF document text
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/jujekobaxuwususezil.pdfIn PDF document text
    • https://japilulijerimu.weebly.com/uploads/1/3/0/7/130738614/xatabajitizug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_5ac4b3f5a6af459ba79f96afb0ff0a98.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_b7e906df181b419782e5b7b5f4a0da1c.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 5132 bytes
SHA-256: 587d9d8591213a6324680d83d1cd70c1b4e858a7dcf736ae6fb205ba446566b2
font_01_sfnt_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 10844 bytes
SHA-256: 066766ba88e026ce00dff666c81c64690f387efbfc725a222be046307a601cbd

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