Malicious PDF — malware analysis report

Static analysis result for SHA-256 91013b1e06e85b10…

MALICIOUS

PDF

118.4 KB Created: 2021-02-22 20:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3cb4c76ae02b7ffa0ad05ae7ada853be SHA-1: 8384d1de9cbf9e7e18ccfe2012210de7f5465cad SHA-256: 91013b1e06e85b100ce97ea93aead0b150e5de4a88438a585872fc0d3b2c8395
126 Risk Score

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. The document body, though heavily obfuscated, contains a URL related to making money, suggesting a lure. The embedded URL `https://jacksth.ru/123?utm_term=how+to+make+money+on+the+side+as+a+software+developer` is likely the primary malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=how+to+make+money+on+the+side+as+a+software+developer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425224/normal_602c01ac75cd5.pdfIn PDF document text
    • http://biggymstoe.com/783964114505kwcp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491665/normal_5fcaad8be377f.pdfIn PDF document text
    • http://zatoboyvibor.fun/29158606319otw8h.pdfIn PDF document text
    • http://vikiwamatibude.22web.org/gipajowexagasagekara.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fffa10faac3c.pdfIn PDF document text
    • http://gujifofaxewoman.22web.org/75453919193.pdfIn PDF document text
    • http://duvevonisupobav.22web.org/digi_002_work_with_pro_tools_12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevalegija.rf.gd/happy_birthday_to_you_pallavi_ringtone.pdfIn PDF document text
    • http://wozaxanakix.epizy.com/skyrim_how_to_level_up_your_smithing_fast.pdfIn PDF document text
    • http://waboxizolomove.rf.gd/nokia_atf_box_setup_free.pdfIn PDF document text
    • http://josetevuj.epizy.com/gixevarinat.pdfIn PDF document text
    • http://tosogaxaf.rf.gd/tamexisebizezawudalap.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/pobudevovokanowojumovalel.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001930d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1930D 5560 bytes
SHA-256: 762e52234dc43327bb810687c6edc219c98da59e251bd331a30d7a7d08664c30
font_01_sfnt_off0001a5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5E5 11312 bytes
SHA-256: 84940f3bd36c5771b3780f3a47c54901627d83311daa225fb12e506b581c1dbe

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