Malicious PDF — malware analysis report

Static analysis result for SHA-256 748ed7876993152d…

MALICIOUS

PDF

37.9 KB Created: 2020-04-05 13:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 50b98940fb8c139e3b9b2208701b38eb SHA-1: 4008a639ab1051be653f33283820f2fa17bd14a2 SHA-256: 748ed7876993152d1b1e24d85bd9811fc7b82f8873cd2c70395d7af118c65f4c
136 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URLs that likely lead to malicious content or further infection stages. The ML classifier strongly indicated maliciousness, and the PDF_RANDOM_URL_LINK heuristic identified an algorithmically generated URL. The document body, though partially corrupted, contains some of the same URLs, suggesting an intent to direct the user to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://arthouseofhope.org/uploads/1/3/0/5/130588349/130588349.html#tipos+de+diseno+organizacional
    • http://sunsetridgegoatmilksoap.com/uploads/1/3/0/5/130547552/9776042.pdf
    • http://skoobecat.com/uploads/1/3/0/2/130289773/2404246.pdf
    • http://illegalgarageconversionsmadelegal.com/uploads/1/3/0/6/130603977/101640d43d8ee.pdf
    • http://realmarketcars.com/uploads/1/3/0/8/130873915/nobekafi_nagopabo.pdf
    • http://franklinandfranklinsh.com/uploads/1/3/0/7/130738625/2464362.pdf
    • http://homecleaningcleanhouse.com/uploads/1/3/1/0/131071057/195072.pdf
    • http://artculturevs.com/uploads/1/3/0/5/130540134/tobururelegabiz.pdf
    • http://sofazen.com/uploads/1/3/1/3/131378921/ca4a09.pdf
    • http://climatcool.net/uploads/1/3/0/3/130313410/lufewesuninug.pdf
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006beb.bin
b0b92e7224f26543b2f4401b8f90491ea270020f75a801eb2f25c52e96747b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEB 8064 bytes

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