Malicious PDF — malware analysis report

Static analysis result for SHA-256 33db29b58d74d4a4…

MALICIOUS

PDF

88.1 KB Created: 2021-09-17 22:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21d587a79f9c18aea870a6146557fa8a SHA-1: ca7d96a7175fee5aa63f25cb3d4455226d7760c3 SHA-256: 33db29b58d74d4a41714fe200421a063c84b5508391c600d4a494a6d5ecb0d4b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a credential phishing lure, impersonating Amazon and directing users to a suspicious URL. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest it's designed to trick users into submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://smidgel.ru/uplcv?utm_term=adding+filelinked+to+firestick.
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=adding+filelinked+to+firestick PDF link annotation
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/50422282380.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/wizifok.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e3037627e---bokarenegesuwegavas.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/16226282683.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/potilenafuzafozane.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161445601ad975---67324281372.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/ruxaruxunag.pdfIn PDF document text
    • http://goref.ru/files/file/mesapozezujuwevadafo.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/25590967684.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/99430073039.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/37898046417.pdfIn PDF document text
    • https://mackbeks.com/files/file/gegidanidogijexukubomafu.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16311623181580063485.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/13371643360.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/kedozivonikavawof.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/mipinesaronosuna.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/5925794239.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/19095011072.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/tazokodagixuxo.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/zezovozelarimubatojojak.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/28400676831.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/mibasimubewikakoxewevos.pdfIn PDF document text
    • https://hiroyoung.com/data/files/somedivazozinekuzuz.pdfIn PDF document text
    • 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_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 10564 bytes
SHA-256: 8701fd12a4a35f877ad91c01d51daf51d9c118925da08621f2495e6904cc8d8b
font_01_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 18180 bytes
SHA-256: 5d4e76271cd559e14dbf8d600deaa7e10bde997a03f8ce3295dc56b67355d4fe
font_02_sfnt_off00013a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1