Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b834b3d561c210…

MALICIOUS

PDF

47.1 KB Created: 2020-03-29 10:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: b607e3d8d38c31c84dfa526ef25de7b0 SHA-1: 43bf2742807b8d1cfe5dea482dd63c373fde240d SHA-256: 98b834b3d561c2107d929384a8085a01174e95e063086b86ac473afc3330f7a9
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified as a PDF link farm, suggesting a tactic to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the extensive linking pattern indicates a likely intent to drive traffic to potentially compromised or malicious websites.

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://kreativekidsworld.com/uploads/1/3/0/4/130489567/130489567.html#cuidados+de+estomas+enfermeria PDF link annotation
    • http://getazoeband.com/uploads/1/3/0/7/130775551/felifukibez.pdfIn PDF document text
    • http://mail.bikiniusa.com/uploads/1/3/0/4/130483396/9211178.pdfIn PDF document text
    • http://crowdergize.com/uploads/1/3/0/6/130639953/4cd696e9c7ba.pdfIn PDF document text
    • http://rockandbach.com/uploads/1/3/0/5/130544009/5075624.pdfIn PDF document text
    • http://integrianutrition.com/uploads/1/3/0/4/130435577/511414.pdfIn PDF document text
    • http://thechelseapub.com/uploads/1/3/1/1/131163535/16da1c93f6aa4f.pdfIn PDF document text
    • http://esbeesignsystems.com/uploads/1/3/0/2/130271041/6266651.pdfIn PDF document text
    • http://coachtosuccess.co.uk/uploads/1/3/0/8/130814129/2475390.pdfIn PDF document text
    • http://lisagumerman.com/uploads/1/3/1/0/131070646/xuramagunuwin-desotel.pdfIn PDF document text
    • http://californiacustomwindows.com/uploads/1/3/1/3/131383734/lubawiwipop-rakigisigesez-jopekazuwo.pdfIn PDF document text
    • http://mpaclarke.com/uploads/1/3/0/6/130604423/fupuzifiso.pdfIn PDF document text
    • http://christineruth.com/uploads/1/3/0/5/130539270/6a3b7cf36fc01f.pdfIn PDF document text
    • http://izipnotary.com/uploads/1/3/0/8/130813777/lexusuvijagus.pdfIn PDF document text
    • http://allurebundlesandmore.com/uploads/1/3/0/5/130550911/ruwimirifibagusokopo.pdfIn PDF document text
    • http://epicgrouptours.net/uploads/1/3/0/6/130620628/190443a7a.pdfIn PDF document text
    • http://dczstrategy.de/uploads/1/3/0/6/130620321/f6ff79b4c.pdfIn PDF document text
    • http://drummersanonymous.net/uploads/1/3/0/7/130739893/dafivagusowevuluxo.pdfIn PDF document text
    • http://puertoricandj.com/uploads/1/3/0/8/130813834/lagenu-susesekejafol.pdfIn PDF document text
    • http://www.thesanfranciscogeneralcontractor.com/uploads/1/3/0/2/130289495/lekuteda_ziwigapazus_zuxorifawip_nikamurevop.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7747 8832 bytes
SHA-256: c0bef8d66b9ebcaa61de7013e92c399b0ed7ff8ee0821f88d510432193cf74e7
font_01_sfnt_off00009779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9779 16312 bytes
SHA-256: 1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c

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