Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60a4eb79b9baf3c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 03:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5640772f100ec17a9a0982edd0729d5e SHA-1: b91c7214a7ba1c85736e603488c6affccef0fc40 SHA-256: a60a4eb79b9baf3cbc7733ca04b9f6205b99d507f4f6b66ced026e5a629c8da4
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with a high-confidence heuristic identifying it as a link farm hosted on disposable domains. One link points to a PDF hosted on 'superiorservicesandsolutionsfl.com', which is flagged as a malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/35649568299.pdf In PDF document text
    • http://kanomax-nsk.ru/images/fudemowabafexifisoperazar.pdfIn PDF document text
    • http://contua.org/userfiles/file/zusidifegevimefol.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/tigetixabigal.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/towasagexufuvarabamek.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/vapofafibufinuzaxukugem.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/71075882437.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/64980980538.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/10045813967.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/36200066601.pdfIn PDF document text
    • http://net-marketing.hu/images/files/87257959488.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/lumesojusa.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133293caaaab---fapobidefutuxowaga.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/pilenosaxenemokatelokixaz.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/80152427627.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/nojotekoji.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/82916201090.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/loletugotovulapufekadorod.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/bibigogaxogo.pdfIn PDF document text
    • http://armanetti.com/images/kurubenugipid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=app+package+disabler+proPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 19784 bytes
SHA-256: 1af31b35a9e06e24dc180bb17b134f6c783d3fbeea3f5939932fe50baff599dd
font_02_sfnt_off00011f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0E 10700 bytes
SHA-256: 5c913667dd67334a212dc6c6c57b9744c7a8fedaf4d31d92ac37ffbfe03eec94