Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b1b2ff1e0b7240…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 12:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8bc16d024e77d862be4dc1c7a4515886 SHA-1: 6a5b36966e386f16237ce72d6e86613cfe9653cd SHA-256: 89b1b2ff1e0b7240220bed6417d6d3ad53c835111f9aed88c724e7157ea61dc6
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and the 'SE_CALLBACK_LURE' heuristic strongly indicate malicious intent, identifying the document as a callback phishing or tech-support scam. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious sites or initiate fraudulent contact. The presence of many unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pajagosakevabopefudired.pdf In PDF document text
    • http://hangnhatbanonline.com/upload/files/buwinud.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614217167e84c---38082815480.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/4230256690.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/39724837663.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/pebadulosi.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/29490817968.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/sefarolizumipusawan.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/97679947716.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/sapasusepuzi.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/60293943701.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/11783760421.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/xukolipaparomasupin.pdfIn PDF document text
    • http://exima.kr/userData/board/file/55950694906.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/23954135911.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/ladilavu.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210910/files/20210910081239.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/xelipexerawenogafazoril.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/butadewaxinajum.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/23116597452.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/dibotuguwotaxafifave.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631230242_1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+ruby+gba+hacksPDF 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_off0000ac7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7F 10888 bytes
SHA-256: 4d3fa41bcc19397e514a8faccc292d6220cc11d56ab7718e7c9abdbb1543b1a8
font_01_sfnt_off0000c589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC589 15928 bytes
SHA-256: 7aa29f5a8e852074777c068287c144c1df08ee9a33147b70e1c9c5c466774094
font_02_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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