Malicious PDF — malware analysis report

Static analysis result for SHA-256 88565bf140b05ae2…

MALICIOUS

PDF

41.0 KB Created: 2020-06-03 15:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 6ac2f89ada55ca7a970a1c357fd48405 SHA-1: 86ef42ca464b12ce24510b44d84331b4aa118266 SHA-256: 88565bf140b05ae213b9b9e7ce8fbf11091e4c43cce0cdecc087e2b3cd58c893
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on similar domains, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

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://cbiofrossmoor.org/uploads/1/3/1/6/131606396/131606396.html#cadastral+surveying+textbook+pdf PDF link annotation
    • http://voipex.us/uploads/1/3/0/9/130969726/xadefatituje.pdfIn PDF document text
    • http://rhsimb.org/uploads/1/3/1/0/131070309/2374329.pdfIn PDF document text
    • http://premierbeachfl.com/uploads/1/3/0/7/130738623/ccb980749b7.pdfIn PDF document text
    • http://maison-argein.info/uploads/1/3/0/7/130740590/a6c1bbd.pdfIn PDF document text
    • http://jeremyjed.com/uploads/1/3/0/7/130739116/9339390.pdfIn PDF document text
    • http://4azhouses.com/uploads/1/3/0/6/130621407/vubumu_monogiden.pdfIn PDF document text
    • http://topendimgsupportnetwork.com/uploads/1/3/0/5/130550805/1830309.pdfIn PDF document text
    • http://giltnercareers.com/uploads/1/3/0/3/130323124/pofosawuvaw.pdfIn PDF document text
    • http://kingsandqueensny.com/uploads/1/3/0/8/130874297/576727e7627d4c.pdfIn PDF document text
    • http://mx.therapywithtara.com/uploads/1/3/1/0/131070619/2563355.pdfIn PDF document text
    • http://botte-boot.com/uploads/1/3/1/4/131438313/8142553.pdfIn PDF document text
    • http://2j1.undesirable.us/uploads/1/3/0/5/130552053/xisowutafif-wovij-xadimexefodax.pdfIn PDF document text
    • http://webmail.grinandgrowchildcare.org/uploads/1/3/1/4/131438474/wubefifinudagivonur.pdfIn PDF document text
    • http://webmail.snowhillmd.gov/uploads/1/3/0/6/130620549/2910857.pdfIn PDF document text
    • http://cbiofrossmoor.org/uploads/1/3/1/6/131606396/terms.htmlIn PDF document text
    • http://cbiofrossmoor.org/uploads/1/3/1/6/131606396/dmca.htmlIn PDF document text
    • http://cbiofrossmoor.org/uploads/1/3/1/6/131606396/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gifamadez.files.wordpress.com/2020/05/xenabebin.pdfIn PDF document text
    • https://vasoponox.files.wordpress.com/2020/05/94432885951.pdfIn PDF document text
    • https://digawuxedado.files.wordpress.com/2020/05/fosirugutixoragodefim.pdfIn PDF document text
    • https://bizipom718967414.files.wordpress.com/2020/06/pojoxokugofi.pdfIn PDF document text
    • https://merefipo.files.wordpress.com/2020/05/fewudivusumu.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://scripts.sil.org/OFLIn PDF document text

Related samples 3

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_off00007292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7292 10936 bytes
SHA-256: bcc829bf82b1302a904df8fec5f3c18b9356ccd6f1d56fe56e567d4a9b07a4e4

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