Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c26ba509554809…

MALICIOUS

PDF

46.0 KB Created: 2020-03-07 17:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 23cbe04bd7b2a142dba9becefb44b928 SHA-1: 2d6aa15c9fa88cfe382afb2f26833ff09a579433 SHA-256: c6c26ba509554809d72be1563d757257157311262d021f1c85e9be0ab4e8a06c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a lure for "Hindi language essay pdf download" and embeds a large number of external links to other PDF files hosted on various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to distribute content. The primary attack pattern involves directing users to these external resources, which likely host further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://77yhi.bpmtc.com/uploads/1/3/0/6/130640191/130640191.html#hindi+language+essay+pdf+download PDF link annotation
    • http://www.thegivingvinethriftstore.com/uploads/1/3/0/8/130814731/wenobezi.pdfIn PDF document text
    • http://oldschoolmechanics.com/uploads/1/3/0/5/130550997/1619310.pdfIn PDF document text
    • http://arccnc.org/uploads/1/3/0/5/130540134/karomedusinavala.pdfIn PDF document text
    • http://mta-sts.mail.minttocraft.com/uploads/1/3/0/2/130272985/5263235.pdfIn PDF document text
    • http://blueseasmarinesurveys.com/uploads/1/3/0/5/130550857/7619760.pdfIn PDF document text
    • http://lydiamendise.com/uploads/1/3/0/4/130476579/fb1fd6dc995912d.pdfIn PDF document text
    • http://citadelhomeservices.ca/uploads/1/3/0/6/130620859/xujezumomalakiw.pdfIn PDF document text
    • http://ecoreflection.info/uploads/1/3/0/2/130272649/pefesidiru.pdfIn PDF document text
    • http://pqwoc.org/uploads/1/3/0/6/130604111/gukokuluk_dejefaruzedeb.pdfIn PDF document text
    • http://justanothernurse.com/uploads/1/3/0/2/130289377/3688488.pdfIn PDF document text
    • http://www.souplandcreations.com/uploads/1/3/0/5/130550777/7747565.pdfIn PDF document text
    • http://www.laurawinnemann.com/uploads/1/3/0/4/130476221/357d702cd666.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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00006925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6925 7888 bytes
SHA-256: 74a2f9a28b05b2a2c36b5b3cfb09fcc9dccbec64cc5ebe1ec5675dd0b690cdb1
font_01_sfnt_off000087d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D7 2652 bytes
SHA-256: e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea
font_02_sfnt_off00009107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9107 9128 bytes
SHA-256: ea1d191b75187dc2135a98c55db80fbecc02fe2b579af922e3783412dd84a995

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