Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4507b857e4c55c2…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 14:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38ce33ee9ac3b03e52e32e9481a4f488 SHA-1: 00f97efe273fdc18345534c7fd8058fac91a0492 SHA-256: d4507b857e4c55c2fd4ac422f000086b574964713cf7423ff1166147a4a56f30
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. The 'SE_CALLBACK_LURE' heuristic specifically indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://aljazeerahdrilling.com/userfiles/files/26347919412.pdf In PDF document text
    • https://schmitz.cz/res/file/dofowuvule.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///314402401.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/81552259646.pdfIn PDF document text
    • https://parc-hotel.info/file/83079218348.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/42602551631.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219251938102506.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429fe11ab83---namiduvijavaxigujekozan.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021919238574586.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/jujaleba.pdfIn PDF document text
    • http://lulanjina.net/upload/files/levupijazunutuwotuzat.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/29031720613.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/telifitotogumelibogotira.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/lubitalefagug.pdfIn PDF document text
    • http://sanjarbek.uz/userfiles/file/vixifirusapidu.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/degod.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/fizopukazigapomobexi.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/95470940664.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/butibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=geometric+series+test+calculatorPDF 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_off0000af36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF36 16400 bytes
SHA-256: e8548ed759820f49c7a769c468453fd47d682682305ed26c290923b2f10b5d65
font_01_sfnt_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 10428 bytes
SHA-256: 4206e513512690a7df9c1d80dc507cafb73ac658f43ce6af70324393d36a812b
font_02_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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