Malicious PDF — malware analysis report

Static analysis result for SHA-256 7815b60bc6c84de9…

MALICIOUS

PDF

37.4 KB Created: 2020-05-18 10:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: f0714c88272edd35dd57a816e0b86dbd SHA-1: dc7cc26d227c744ee5c8b5a1ce853f2129304b41 SHA-256: 7815b60bc6c84de9d46d677c915468cb5670559b2f9b8970633a3583d8d7fc7c
144 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, indicating a link farm designed to host malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the numerous SEO-like URLs suggest an attempt to distribute malware or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jennaheinaaho.com/uploads/1/3/1/4/131438604/131438604.html#bloons+td+5+crack+android PDF link annotation
    • http://cool-it.org/uploads/1/3/1/6/131636960/sorumi.pdfIn PDF document text
    • http://mindfullymovedmoved.com/uploads/1/3/0/4/130476033/femopukusudax.pdfIn PDF document text
    • http://crisperfeitocorretora.com/uploads/1/3/0/5/130540155/8a74d.pdfIn PDF document text
    • http://rwpdivephotography.com/uploads/1/3/0/3/130313190/6572114.pdfIn PDF document text
    • http://elogllc.net/uploads/1/3/0/2/130272638/ruruk.pdfIn PDF document text
    • http://thedermamedic.com/uploads/1/3/1/3/131381369/puniruwukafu-wemamanufuximuf.pdfIn PDF document text
    • http://juneradicchi.com/uploads/1/3/0/9/130969473/1936605.pdfIn PDF document text
    • http://lifeandlandscapesphotography.com/uploads/1/3/1/4/131438456/jiloji.pdfIn PDF document text
    • http://rebeccasdesign.com/uploads/1/3/0/2/130271137/7ce5fead.pdfIn PDF document text
    • http://coastalvapers.com/uploads/1/3/0/9/130969129/vovapila.pdfIn PDF document text
    • http://dobiehills.com/uploads/1/3/0/7/130775527/xufog_mebimomupa.pdfIn PDF document text
    • http://perisedighlaw.com/uploads/1/3/1/3/131384289/mepisevemoguxu.pdfIn PDF document text
    • http://integrityfixedincomemanagement.com/uploads/1/3/0/4/130490006/6721121.pdfIn PDF document text
    • http://statenislandsam.com/uploads/1/3/1/4/131437385/3525c3f013.pdfIn PDF document text
    • http://backrowmovietalk.com/uploads/1/3/0/2/130271167/5e26da5.pdfIn PDF document text
    • http://adamcrombie.com/uploads/1/3/0/8/130814235/sijemifemag.pdfIn PDF document text
    • http://midnightcoastgroup.co/uploads/1/3/0/4/130488091/timokav.pdfIn PDF document text
    • http://armadalecofc.com/uploads/1/3/0/6/130620813/kufisumuw.pdfIn PDF document text
    • http://foreverpetprints.com/uploads/1/3/0/6/130605240/julawe.pdfIn PDF document text
    • http://ottawatowingpros.com/uploads/1/3/0/7/130740048/lerirodarejek.pdfIn PDF document text
    • http://scarletexposurephotography.com/uploads/1/3/1/4/131437821/pakaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6830 10184 bytes
SHA-256: 91c9993f18f9d0ad3b7d1d1ac1c10d89f1c28e4c35c98a7804d3519624d0ba11

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