Malicious PDF — malware analysis report

Static analysis result for SHA-256 988f7117b787f92e…

MALICIOUS

PDF

92.0 KB Created: 2021-03-12 01:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4684f9a017a6f66d776bd33bd3983a78 SHA-1: 2bdc8de47ceeaf3a1db04072973b593dacdeaf4e SHA-256: 988f7117b787f92ed0221085d9fd8fa5dbf9deda86c117bc917e5e3d57485ea5
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 by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a worksheet, likely a lure to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=changes+of+state+worksheet+part+a+intermolecular+forces PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377102/normal_60028a03df1dc.pdfIn PDF document text
    • http://kafofal.mygamesonline.org/rivatezuvekobufo.pdfIn PDF document text
    • http://trujillostacoshop.com/police_vs_crime_online_complaintzy5uw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_5fd1d607b1d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489045/normal_602b713d3da61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467036/normal_60035f3b0cd42.pdfIn PDF document text
    • http://rutekotugu.22web.org/widigogemodoximofufimuko.pdfIn PDF document text
    • http://tepuragebu.iblogger.org/55603048052.pdfIn PDF document text
    • http://kungfumalibu.com/dell_latitude_e6410_i5_datenblatt4glfj.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/how_to_tie_a_slip_knot_for_jewelry.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wujixus/is_2008_honda_odyssey_a_good_car.pdfIn PDF document text
    • http://xikapewegoruzom.epizy.com/pizaxuke.pdfIn PDF document text
    • http://dexizijisub.atwebpages.com/muvikudegelotebizifotin.pdfIn PDF document text
    • http://xoxekojut.onlinewebshop.net/causes_and_consequences_of_environmental_pollution.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/77354389073.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 5488 bytes
SHA-256: 0de7d2c5c917bd84eb466316d0f21b932d464b8298e15ef7d6e3bc323b79cdd0
font_01_sfnt_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 11296 bytes
SHA-256: 8fac1175fd037ca6c4978f931eecd5de6d3df89fd69274500b61fbd4fd09158b
font_02_sfnt_off000154a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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