Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88ad9633ba4d8f6…

MALICIOUS

PDF

95.8 KB Created: 2021-10-17 20:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: eeaa99b44f6539e90a81a0a0bbefe5e3 SHA-1: d97d11ab146d9cf321cdb4a425aa8724839565ee SHA-256: d88ad9633ba4d8f64eecdeee2361a33ed646a51ae433c5bc00b19210be8f0a16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish users through a network of disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://centralcms.coodex.net/galeria/files/tonudadaxuwowex.pdf In PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/37332645783.pdfIn PDF document text
    • http://archbot.pl/files/file/lanimedejenisofuriwosob.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/11362744794.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/josubevibirapevaka.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/75302615974.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/7410869633.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/52117336197.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/zilakaziroxuzasugazamomek.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/95732401098.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/rowizaperimuguwasagabibo.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20211014_061949_187.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/72977653599.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-12/20210912063739796164.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/46797885772.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/91703030582.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/21096168768.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/89276361114.pdfIn PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/66568966982.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/kugatelufadagajudufura.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/11933919586.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/runalugowezogudakekubaxef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=civil+wrong+meaningPDF 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_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 18452 bytes
SHA-256: 53b9dedc3617f7ffa2415f916df0895ad70b207767b927528e63326dbef1abcc
font_01_sfnt_off00014276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8D 10368 bytes
SHA-256: 4b9f4fc09fc2df6ee601c8bbc19cc04de57e96e4160aaf6a78f23286017b8cb5

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