Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8f3cd2eef6b5c5…

MALICIOUS

PDF

93.8 KB Created: 2021-09-10 10:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 228076d675102732f8b37d39143c70e9 SHA-1: 4d963c176f0f036ce36d98dba9c80d51c5c147c4 SHA-256: 3a8f3cd2eef6b5c5541069e038e69e3cab7da4c74ac607400132286a74107cfc
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://elfast.ru/userfiles/file/97032950974.pdf In PDF document text
    • https://karpataljaturizmus.hu/upload/tadutamovunudupulix.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/15212192132.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/bopisewarazipitilek.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346dddaa5dd---81769089463.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/gokoviwijesotopej.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/lumamumusojalozagogifupe.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/82712612190.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/364512617.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/57728384271.pdfIn PDF document text
    • http://www.swiftsecurehosting.com/rsnpromotion/siteuploads/editorimg/file/mivozu.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/21820803002.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/gonifotamitodipi.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/xalasefotabotevow.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/5478161148.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/jotajikudifelizotufili.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/25394704147.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/vufemuwokaviku.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/semumarorarabekejil.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/voliwoguzobanor.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/mominimijidiregiw.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/16068593237.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613588328093c---36481523190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mugen+train+full+streamPDF 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_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 19252 bytes
SHA-256: 1b2f16e10de2b950bccd38e91364c029a791dcc402c59e29a25e1d7a015dad77
font_01_sfnt_off00013a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15234 10528 bytes
SHA-256: 9c809a08622ae905bdc8f7098e58d99ac6f350897d11bb0b1ae9b863b993f203

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