Malicious PDF — malware analysis report

Static analysis result for SHA-256 86530e66ee79c460…

MALICIOUS

PDF

47.3 KB Created: 2020-06-22 07:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: f9d2045624d4f602c4b28ddf1f4eb97d SHA-1: 9e733edc7d27972053b9f0a79f9abfaa54b4c2bd SHA-256: 86530e66ee79c4605b73599c8816329b21781b44d63cefc3d8c2f8d6bdcd1f4f
136 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 are algorithmically generated and point to other PDFs, indicating a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains URLs that are likely part of this distribution scheme. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://juliayarnshop.com/uploads/1/3/0/5/130543552/130543552.html#reinforced+concrete+basics+2e+pdf+download PDF link annotation
    • http://austinturley.co/uploads/1/3/0/4/130477448/xinurugusanoluredamo.pdfIn PDF document text
    • http://andrewbwinslow.com/uploads/1/3/0/4/130476039/2117605.pdfIn PDF document text
    • http://stallionpridecapitalmanagement.com/uploads/1/3/0/6/130639599/keditepej.pdfIn PDF document text
    • http://etplaouar.net/uploads/1/3/0/5/130551445/1047482.pdfIn PDF document text
    • http://sachinhardikar.com/uploads/1/3/0/6/130604775/003654eff59e.pdfIn PDF document text
    • http://autismeonderzoek.be/uploads/1/3/0/5/130547552/rolija.pdfIn PDF document text
    • http://pvatherapy.com/uploads/1/3/1/8/131856039/jipoxog_vefegetokew.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 6

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_off00005fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 5308 bytes
SHA-256: c61ba4eeb308c00410a5e03cf5f5be145ea1fde6a5c3537281e307c57541063d
font_01_sfnt_off000071f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71F9 16996 bytes
SHA-256: c51dd6b8aea43c715b65f23e0de55161ca6746a3614a5dae89b595ca24e660fb
font_02_sfnt_off000089c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C8 10896 bytes
SHA-256: 2ca7e648d178a8fe058656255753c00c75f2c2e7555e76d7bb49513e8e2f10db

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