Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ea4cd6baa67c9a…

MALICIOUS

PDF

42.4 KB Created: 2020-04-01 17:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: 415e6ebfd9328e2fd1880c4cff022852 SHA-1: 661eb32e2de6f33838b49cf677fe1249f94a6f96 SHA-256: 86ea4cd6baa67c9a74f6a629e2ca4ed473aba900f54732fafa4c2a780d52f10f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The embedded URLs are likely used to host further malicious content or redirect users to phishing sites.

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://ias-biz.com/uploads/1/3/1/3/131398025/131398025.html#educational+leadership+philosophy+example PDF link annotation
    • http://yoga-junkie.org/uploads/1/3/0/8/130813582/papaju_reduveza_ludumusam_delosej.pdfIn PDF document text
    • http://thegoodnewsnow.org/uploads/1/3/0/5/130551486/2737238.pdfIn PDF document text
    • http://mta-sts.nutec-remodeling.com/uploads/1/3/0/7/130739234/465038.pdfIn PDF document text
    • http://venturesportfolio.com/uploads/1/3/0/7/130739558/foxanawululuri.pdfIn PDF document text
    • http://nycasianescortscall.com/uploads/1/3/0/3/130323717/7eaf63cb65e7a8.pdfIn PDF document text
    • http://signaturewisdom.com/uploads/1/3/0/3/130323559/c704cbc54488c.pdfIn PDF document text
    • http://mystlwedding.com/uploads/1/3/0/6/130604549/noziwe-mipujege.pdfIn PDF document text
    • http://dnavfitness.com/uploads/1/3/1/0/131070035/18028ecdf.pdfIn PDF document text
    • http://stbbqandcatering.net/uploads/1/3/1/3/131383734/kowatimijulajajulumi.pdfIn PDF document text
    • http://silverfromtaxcorafaela.com/uploads/1/3/0/3/130379696/350414fd112165.pdfIn PDF document text
    • http://medasistsjcoe.com/uploads/1/3/0/6/130621771/xixikeres.pdfIn PDF document text
    • http://kelseycookofficial.com/uploads/1/3/0/2/130289603/2926241.pdfIn PDF document text
    • http://edsnively4iid.com/uploads/1/3/0/9/130969166/zakujimamegekedej.pdfIn PDF document text
    • http://dekeure.nl/uploads/1/3/0/7/130740318/novamasaw.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C74 7080 bytes
SHA-256: 862c705423cbf3d023eb2137c31b71f2a2c424bdd15fec1c81dcc9974ea4c1f4
font_01_sfnt_off00008872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8872 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63