Malicious PDF — malware analysis report

Static analysis result for SHA-256 4361279ecc953f37…

MALICIOUS

PDF

38.3 KB Created: 2020-03-11 12:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: bd511273c3157086afeda312da1ecf75 SHA-1: 84ae84a26ca7fb9f4e7d7f3a552c841e51d4d2cd SHA-256: 4361279ecc953f37618030265486bf6207f0f05966df9af530870f2c26dfa109
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that appear to be part of a link farm designed to drive traffic to potentially malicious 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://adsl-63-204-18-31.benefitplans.org/uploads/1/3/0/7/130774990/130774990.html#causes+of+drug+addiction+pdf PDF link annotation
    • http://www.chevy95.com/uploads/1/3/0/3/130323535/3a8b09b5.pdfIn PDF document text
    • http://bitbreakers.com/uploads/1/3/0/7/130775357/0dd65f7f756.pdfIn PDF document text
    • http://www.sundaysupperseastbay.com/uploads/1/3/0/3/130323311/mapizarobimuxerovub.pdfIn PDF document text
    • http://searchdmd.com/uploads/1/3/0/6/130621342/rufafunakite.pdfIn PDF document text
    • http://kalliopemag.com/uploads/1/3/0/9/130969985/8514716.pdfIn PDF document text
    • http://tireshines.com/uploads/1/3/0/4/130488399/nisizusijoxas-gigat-kosawube.pdfIn PDF document text
    • http://fresnoclovisdentalimplants.com/uploads/1/3/0/3/130313155/nebule.pdfIn PDF document text
    • http://realedchat.com/uploads/1/3/0/7/130739006/bd19537.pdfIn PDF document text
    • http://600bst.com/uploads/1/3/0/4/130477979/8672197.pdfIn PDF document text
    • http://asistencia4x4.com/uploads/1/3/0/7/130739349/5767725.pdfIn PDF document text
    • http://citykittyfurniture.com/uploads/1/3/0/7/130739706/garavufugem_tixetevo.pdfIn PDF document text
    • http://coacharielle.com/uploads/1/3/0/7/130738710/gusararaxogapotes.pdfIn PDF document text
    • http://abeelinebonding.com/uploads/1/3/0/7/130774990/7070291.pdfIn PDF document text
    • http://pogform.com/uploads/1/3/0/5/130588749/pudozekuz.pdfIn PDF document text
    • http://comediancajohnson.com/uploads/1/3/0/3/130323928/13008.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

Related samples 2

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_off00006bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB7 8024 bytes
SHA-256: 0ebe3b0ba04caf0c2949f076d6e8d19d96189d29cef23561d06d5fa50f9e7ddb

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