Malicious PDF — malware analysis report

Static analysis result for SHA-256 76efe77d746967ce…

MALICIOUS

PDF

38.2 KB Created: 2020-05-15 21:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fb0c1bb6cbfed4ae438c7aa00d199de SHA-1: e980718c4b49b9272a1b35126537bd80088ef46e SHA-256: 76efe77d746967ce18cca57f969383eeb941c6dbd389665b820410a1e3aaf84e
136 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. The document body presents a lure related to 'Kashmir university date sheet' to encourage users to click on these links. The primary link identified, http://empresamorenodrywallsteelframing.net/uploads/1/3/0/8/130814687/xukaxu.pdf, is part of a link farm designed to distribute malicious content. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://skinspiritlife.com/uploads/1/3/1/3/131384402/131384402.html#kashmir+university+date+sheet+4th+sem+backlog
    • http://empresamorenodrywallsteelframing.net/uploads/1/3/0/8/130814687/xukaxu.pdf
    • http://perhela.fi/uploads/1/3/0/6/130603782/5795817.pdf
    • http://motherearthlawncare.com/uploads/1/3/0/5/130588703/nolozuj_tomabaje.pdf
    • http://indianapoliskybella.com/uploads/1/3/1/4/131437379/kopogax-jarelemojuseb-fepivomigemibap.pdf
    • http://macabrecandy.com/uploads/1/3/0/7/130775858/204afb9.pdf
    • http://katiehorrill.com/uploads/1/3/1/3/131384544/1219457.pdf
    • http://prolinelife.com/uploads/1/3/1/4/131483343/c5164a.pdf
    • http://dreamplotter.eu/uploads/1/3/0/2/130271165/2565646.pdf
    • http://denverautoquote.com/uploads/1/3/0/7/130739139/7672562.pdf
    • http://healingbalmhc.com/uploads/1/3/0/5/130546237/bead53be96acc.pdf
    • http://happyorangutan.net/uploads/1/3/1/3/131384604/05186e98.pdf
    • http://slingshothawaii.net/uploads/1/3/1/8/131856119/9442689.pdf
    • http://fullarmortrained.com/uploads/1/3/1/0/131070692/xabiba-vazanowitikele.pdf
    • http://milanomanutenzioni.com/uploads/1/3/0/2/130272906/ralokiturijuvex_baxejogumaziju.pdf
    • http://wawonhairandskincare.com/uploads/1/3/1/3/131383497/944dfd1ad778b4.pdf
    • http://yougotsmile.com/uploads/1/3/0/6/130603760/e710d3a.pdf
    • http://blkgrlboss.org/uploads/1/3/0/5/130546486/6485015.pdf
    • http://zodiaccomics.com/uploads/1/3/0/6/130621686/5149c2.pdf
    • http://leadrxship.com/uploads/1/3/1/6/131636772/9668343.pdf
    • http://theheritage-project.com/uploads/1/3/0/6/130639382/sarulovazuxidov.pdf
    • http://advancedpsychbilling.com/uploads/1/3/1/4/131483128/2560693.pdf
    • http://marianswain.com/uploads/1/3/0/7/130739686/wopifilewor.pdf
    • http://genelco.net/uploads/1/3/0/9/130969868/4014375.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068e6.bin
5ec95af48bc375aa766b744c6e42fec8c60b83170dc4782b45ecca1cf45b87f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E6 10588 bytes

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