Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8127c3549dacf7…

MALICIOUS

PDF

32.6 KB Created: 2020-05-16 08:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: b1e105106a7bffaac44501855d64c74f SHA-1: dd1c2835c94284dcabe38b7db998fc8e3d335dc2 SHA-256: 4f8127c3549dacf7d40a36523d320a0c1dc26247cc2b1b2c76909bedb37f3666
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, also contains URLs. These links likely serve to direct users to malicious websites or to manipulate search engine rankings. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://furaharentalhomesclinic.com/uploads/1/3/1/6/131606231/131606231.html#kleenex+facial+tissue+bundle+230+sheets PDF link annotation
    • http://dhruvautomations.com/uploads/1/3/0/6/130620691/675451.pdfIn PDF document text
    • http://kuroshgallery.com/uploads/1/3/0/2/130289179/6a3ab8418.pdfIn PDF document text
    • http://retreatinsider.com/uploads/1/3/0/8/130814611/nutonavukiveka.pdfIn PDF document text
    • http://meetthecandidates4dc.com/uploads/1/3/1/4/131452961/patet.pdfIn PDF document text
    • http://portsmouthboilerrepair.com/uploads/1/3/0/7/130739628/3c17b7e8d686.pdfIn PDF document text
    • http://almostarthistory.com/uploads/1/3/0/5/130539297/2053318.pdfIn PDF document text
    • http://theschoensonline.com/uploads/1/3/0/2/130272352/426c0c8.pdfIn PDF document text
    • http://humboldtholisticfoundation.com/uploads/1/3/0/4/130483331/7022011.pdfIn PDF document text
    • http://weekenderspresent.com/uploads/1/3/0/2/130289353/9396235.pdfIn PDF document text
    • http://rorybledsoe.com/uploads/1/3/0/4/130435821/dd14b0.pdfIn PDF document text
    • http://retruckaust.com/uploads/1/3/0/8/130873899/6913276.pdfIn PDF document text
    • http://madewithlovebydanielle.com/uploads/1/3/0/5/130551086/6865e68a543171.pdfIn PDF document text
    • http://araynatechnologies.net/uploads/1/3/1/4/131438693/muwetixe_bamexa.pdfIn PDF document text
    • http://inglenook-books.com/uploads/1/3/0/6/130604101/1075212.pdfIn PDF document text
    • http://ndcca2016.com/uploads/1/3/1/3/131384688/xupivagipes.pdfIn PDF document text
    • http://onlineautoloan.ca/uploads/1/3/0/6/130639774/xeladalamotov.pdfIn PDF document text
    • http://revenuemanagementworkshop.com/uploads/1/3/1/3/131381840/a5159.pdfIn PDF document text
    • http://frenchbullyz.com/uploads/1/3/1/3/131380438/fojipararaxepufib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 4

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000544e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x544E 10000 bytes
SHA-256: b791c0da0b95f4b850ad9632cca32167cd9ea5b87133bfbb338df2b2ea315fd6

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