Malicious PDF — malware analysis report

Static analysis result for SHA-256 143fca09eafeb703…

MALICIOUS

PDF

54.0 KB Created: 2020-06-24 08:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24e793b36170a13f79972e8a834bd884 SHA-1: f87544a6dd564810ff5a48da3b93e9c21406654d SHA-256: 143fca09eafeb7038b26e8c5bdbc05d9b35182eb57a21b2b2e0886bbb1f9cbc0
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 are hosted on domains that appear to be part of a link farm. The document body text, while obfuscated, includes a URL that points to a collection of PDF files, suggesting a potential malware distribution or phishing campaign. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links is a common tactic for SEO poisoning and redirecting users to malicious 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://thelinehan-dbt-internationalsociety.org/uploads/1/3/1/1/131163945/131163945.html#shaw+direct+channel+list+pdf
    • http://baconsmilesministry.com/uploads/1/3/0/4/130475984/pudixoxek.pdf
    • http://talbotspecialriders.com/uploads/1/3/0/3/130312998/e5454dd.pdf
    • http://haileymillette.com/uploads/1/3/0/4/130488476/wuduzosugaruben.pdf
    • http://kashforkeys.com/uploads/1/3/0/5/130546385/nagema.pdf
    • http://tatumpools.com/uploads/1/3/1/4/131437637/a9eab3c5e.pdf
    • http://thefitferret.com/uploads/1/3/2/6/132681699/zewiladasoj-nigexidaruf-xixovosipefi.pdf
    • http://jillisahope.com/uploads/1/3/1/3/131379321/vebaxoven_zisisatekuw.pdf
    • http://indianremocalactnhd.com/uploads/1/3/0/7/130739754/8694855.pdf
    • http://btaccountingandtax.com/uploads/1/3/0/3/130323342/6828297.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008aac.bin
589de25cbc00cbaa437381e31e61bdbc64b4fa11acf709e406ab662107b1b6d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAC 5116 bytes
font_01_sfnt_off00009c0a.bin
ffbc680586aa73999e9cbb90253bb3d922e3f517d8afa4dbef4112389418412d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0A 1736 bytes
font_02_sfnt_off0000a48f.bin
d2661228b7d509bb9bbf408404c6332d0903e7971655581d19abf30c4b5a3f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA48F 11752 bytes

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