Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc262d05fc37f75…

MALICIOUS

PDF

72.3 KB Created: 2021-09-13 04:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac2d535ca205fc2157c08bddff0a01d9 SHA-1: bee82f298bc059648504b520376fdf16ff85c771 SHA-256: dbc262d05fc37f75b7eaf229b865b25df54d3404e20c30f3760d0d3f40682afd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a fraudulent number. Although no scripts were extracted, the presence of numerous embedded URLs, some pointing to potentially disposable domains, further supports a phishing or scam-related attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/4870357415.pdf In PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/33441767189.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/86384956394.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/mixari.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/36012744807.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/xavoxanegat.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/35689864939.pdfIn PDF document text
    • http://friulanapanini.com/images/file/41588605.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/felejezi.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/97742316294.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/zamutexerekelajewezomekos.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/futezozomide.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613744ed8681c---sawokiromonodovagufo.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/22869472870.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/vugewiwenebuweturu.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/55834351045.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/18910518617.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///menov.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/vugewe.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/05dbf24a824133f1243cb88e801deb3c/18750338083.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/9533040828.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/baxuzuwego.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/tisixenisiga.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/18547827583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=vpn+pro+download+apkPDF 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_off0000b886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB886 10044 bytes
SHA-256: a67ac1609839479b5f3a24387de0103d4e8e75dd8c4a548efaa23aab0adc04bf
font_01_sfnt_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 17196 bytes
SHA-256: e760b1335dad1070ffd7f75dc71b2d182384ec8b3cf7d513de69b6f1ee028c0e
font_02_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1