Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc973497f65c8bf…

MALICIOUS

PDF

96.1 KB Created: 2021-09-17 11:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e48a17694c7b888c90ca1089a6aceafa SHA-1: ed562f16d75fbdff5bfc3f7b8be871b122f6539f SHA-256: 9cc973497f65c8bf8d1100eee4b5b3215cd3ab703ffe7a1a457e0c91425c30d4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it serves as a lure to a malicious site or to initiate a fraudulent phone call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dalnoboy.org/data/filestorage/upload/files/nipusibevosukotog.pdf In PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/xiziwejuzikujesur.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/23620220870.pdfIn PDF document text
    • https://masukpt1.com/contents/files/40092850194.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210912_4F7AFC90507BF8CF.pdfIn PDF document text
    • http://holzweiss.at/bekojirunamakawowu.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/13258413698.pdfIn PDF document text
    • https://thepainter.asia/upload/files/towexemanazozi.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/musevemebugodugajit.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/nowuwibisipode.pdfIn PDF document text
    • http://dhf-china.com/d/files/murukerulusepimumo.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/taxatixokomog.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/96814639907.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/rituz.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/mulol.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/zijemorisedixinimisu.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/borekemapal.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b20a40fcdf537ba62155bc71a537d53e/25660491905.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/25858071763.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/64315502291.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/zuxipesikewizogo.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/julekeseromukagedezataset.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/97255985720.pdfIn PDF document text
    • http://daiichitravel.com/uploads/news_file/33482521318.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18dea1c33---debawegumelewenutitalole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=budapest+menetrend+androidPDF 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_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 10660 bytes
SHA-256: 3bbfb88ab3cf0824481fc7dc199e1ef0aab1d5738b1c17bc55dec1c55dee36d3
font_02_sfnt_off00013702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13702 22088 bytes
SHA-256: 6cef782bf90e9612f7f418cc41fa52501de5c0c9352b8a159ae24b95b5b466cb