Malicious PDF — malware analysis report

Static analysis result for SHA-256 771a3c7fadb05541…

MALICIOUS

PDF

80.9 KB Created: 2021-05-03 16:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 45713e3d3186b76ff5ab87c1901f89f5 SHA-1: f67ba73a38323be4d11825c6589ed1d4320064e8 SHA-256: 771a3c7fadb055418e4df25bfd0d92a0c1ec2d12bf540fb40ecc2b7b97a148fa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'maypoin.ru'. The PDF structure suggests it's a link farm designed to redirect users to potentially harmful content, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=el+nombre+de+jesus+letra+gilberto+peguero PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384484/normal_5fd0f9193f724.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/saxon_advanced_mathematics_test_forms.pdfIn PDF document text
    • https://cdn.sqhk.co/fasaparoba/wIQjaja/arewa_24_tv.pdfIn PDF document text
    • http://revodegasiger.sportsontheweb.net/all_bangla_boi.pdfIn PDF document text
    • http://bukipumil.mypressonline.com/83959328402.pdfIn PDF document text
    • https://cdn.sqhk.co/vapiwibisa/hbnbhje/android_mobile_action_games_list.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/pavelikinokogo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491175/normal_60058010b8cf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417138/normal_604d187b54780.pdfIn PDF document text
    • http://nuwetiveguvo.mypressonline.com/99573634597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_601b44ad4e54d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_6045c3099f082.pdfIn PDF document text
    • http://bexukitekivotap.22web.org/concepto_de_analisis_foda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409606/normal_6003b66784429.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/71621853838.pdfIn PDF document text
    • http://lagefow.epizy.com/guzuzosaf.pdfIn PDF document text
    • http://budivisatenebo.rf.gd/tozobofipelanifofup.pdfIn PDF document text
    • http://gijomifede.rf.gd/meseguv.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/xegalajoperakebefotedo.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/functional_requirements_document_template_word.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 5452 bytes
SHA-256: fddc35adfbe0e795c892c91cd45f074ab0009bd6bbd73eb8ee9d2482b9e77d1e
font_01_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 3596 bytes
SHA-256: 3d254aa66a035f524c53bc30f7e3254988ddb9ff01b0b79e1f949344584e952d
font_02_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 11952 bytes
SHA-256: c98ac16c4b5e6ab9c34191bdf0c23878cd2126b5cfee5f2cd43bc35a94409226
font_03_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 16384 bytes
SHA-256: fb2ac63fb075d256b5587570191ecec806cb29c29da4ebedfc8653ce907d9040

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