Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d687248d8bf0e0e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 09:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 916df6dd31bd7d3c66f02207c223940b SHA-1: e7f0b218a17a142c6feb6e7cb593395b2268f6f4 SHA-256: 7d687248d8bf0e0ee0836ded7982f995c0178e50cc8f5e47eeeff87c21281bf8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious content or facilitate social engineering. The presence of many distinct hosts in the link farm heuristic further supports a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://abwnickersonplaza.com/uploads/files/zasopekasazular.pdf In PDF document text
    • http://koala-al.com/d/files/jozojegumazasubo.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/37919380467.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/62884269495.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/14294585609.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/kolizejiwolurov.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613491e1023b4---76349969841.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/xogebex.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/1576099581.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/zaweb.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/muvudeberukaretemetedomal.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/69a9c9a4b3f30acc6de0fd446a6545be/zomunefalo.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/makumuruxor.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/tijepipawiwir.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/kitux.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210914182623.pdfIn PDF document text
    • http://kunbot.com/upload/files/nivuduronepiku.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/64098940376.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/bujur.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/28411197413.pdfIn PDF document text
    • http://dsagco.com/Upload/file/ratilowaxifegedizu.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/zafegifog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=watch+the+book+of+life+online+freePDF 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_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 10492 bytes
SHA-256: 1304866e55b22bcd915919928c7e813f5a0b605a395d23d06a06a99d801323a2
font_02_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 19312 bytes
SHA-256: e25205a9b6a01bc70ca2edaf919292ecaa7fcef93298834832d0a4351065a0e4

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