Malicious PDF — malware analysis report

Static analysis result for SHA-256 113e90dbd3cbb859…

MALICIOUS

PDF

39.0 KB Created: 2020-06-07 00:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 020e3a1b675659862550844636861a1c SHA-1: 1d7755d0b974f54c1ffaea4cd94dfb19b332dfe1 SHA-256: 113e90dbd3cbb859a0c978fcfe48da14d7306fe94827932fd59adb0c3b302dd8
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 domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains URLs that are likely intended to redirect users to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the assessment of a link-farming or SEO spam attack pattern.

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://ereksitahanlama.com/uploads/1/3/0/5/130589420/130589420.html#exercice+phrase+simple+et+complexe
    • http://cess-less.com/uploads/1/3/1/6/131606134/zowumetekapese.pdf
    • http://amhandyman.org/uploads/1/3/0/9/130969083/3b6380282.pdf
    • http://dns.mjhodge.net/uploads/1/3/1/4/131406234/2419987.pdf
    • http://bebegrama.lt/uploads/1/3/0/6/130621916/dizojinafosozu_legome_fetikopexijedu_soforiwotuviba.pdf
    • http://sparkacademygeorgia.com/uploads/1/3/0/8/130814861/risixotidepeg.pdf
    • http://admin.wbg-bueron.ch/uploads/1/3/0/6/130605178/wijuwebo_tefigoxizo.pdf
    • http://3rhconstructiongroupllc.net/uploads/1/3/0/8/130874679/tivuluri.pdf
    • http://autodiscover.songbugs.com/uploads/1/3/0/4/130489727/5433246.pdf
    • http://airtermia.net/uploads/1/3/0/8/130814250/3471446.pdf
    • http://eastnastyapparel.net/uploads/1/3/1/3/131379532/wulojiluz.pdf
    • http://webmail.hookah-corner.com/uploads/1/3/0/5/130589288/pewofozolam_galedorinir_wuxesojepev.pdf
    • http://x0510464xstreamtravel.xsideas.com/uploads/1/3/0/2/130274301/bowubinigo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ziziverip.files.wordpress.com/2020/06/kepitafepumizatomezuji.pdf
    • https://nolanunumur.files.wordpress.com/2020/06/niwefotavowam.pdf
    • https://lewoxosi.files.wordpress.com/2020/06/kafogoxoval.pdf
    • https://segokowiw.files.wordpress.com/2020/06/78969762332.pdf
    • https://jopawetudame.files.wordpress.com/2020/06/winobumunad.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066f0.bin
e9d3cd66085669eddd82ae21483952108f03a8f3bd07e21ab966cff053e8a34c
pdf-font-stream PDF embedded font (sfnt) at offset 0x66F0 12624 bytes