Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1759e1f91de573f…

MALICIOUS

PDF

74.1 KB Created: 2021-02-17 19:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3caeab22246d06c16eff5e05fe4128b7 SHA-1: b1e59af135867ab4af5ffd3ac83026c9c8d2d9fa SHA-256: a1759e1f91de573f5eae7d73a42d9c70c83815948fde1d8fa43d194a311ae0ee
126 Risk Score

Malware Insights

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

The file is a PDF with a high ML classification and ClamAV detection, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure itself is being leveraged to host and distribute these malicious 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://leonvi.ru/strik?utm_term=vc+andrews+heaven+lifetime+plot PDF link annotation
    • http://jabisoj.22web.org/kimimebegovib.pdfIn PDF document text
    • http://dojimifarekajiw.iblogger.org/zixivenogewotaz.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/c1d3d30aadcc7.pdfIn PDF document text
    • http://maporivibadiwaj.iblogger.org/twitter_app_for_windows_10_free.pdfIn PDF document text
    • http://segipaxi.iblogger.org/sutezef.pdfIn PDF document text
    • http://artelamp.store/tony_robbins_awaken_the_giant_withinpadgs.pdfIn PDF document text
    • http://instapriz24.site/mitosis_worksheet_answers_biologyy2wkj.pdfIn PDF document text
    • http://fit-italy.space/emeria_shattered_skyclave_price2in1t.pdfIn PDF document text
    • http://women-ita.space/zenonia_5_paladin_stat_buildnibre.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/tft_item_build_sheety6p7s.pdfIn PDF document text
    • https://juviroxekeko.weebly.com/uploads/1/3/5/3/135399696/zofeninogesumutukupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nakulugexogi.rf.gd/nitiw.pdfIn PDF document text
    • http://fizaveloxuraje.rf.gd/rowasafegitatikuwotos.pdfIn PDF document text
    • http://mugekalamiwatek.epizy.com/59047031914.pdfIn PDF document text
    • http://tuzegonu.rf.gd/kopejinanovifumu.pdfIn PDF document text
    • http://dejamatokato.rf.gd/turozoloronup.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_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 5512 bytes
SHA-256: 24aaa6b1c0b86099a826cc983e9cc0465726cc35af18ee5b5d75a9b6f18f0e09
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 10504 bytes
SHA-256: 3a3f0bac4143f18fa9eee5ff3c5776f98e4e890c67c0cd3e6878ce61401a059f

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