Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a53b1897bdeb3b0…

MALICIOUS

PDF

165.7 KB Created: 2021-03-19 08:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aa4ba5530e6faa61f738e5b4682f53d2 SHA-1: 5d8a2f9a51d861bd0a484606ef0972906be20281 SHA-256: 2a53b1897bdeb3b0bf7842cf3fc09dd24650d83e7126ee33d35d7f0e365309de
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as https://druttle.ru/wix?keyword=pokemon+crystal+strategy+guide+pdf, are likely used to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://druttle.ru/wix?keyword=pokemon+crystal+strategy+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394061/normal_601755972f93c.pdfIn PDF document text
    • https://cdn.sqhk.co/moxawitab/vBnhbVa/torozuzavivatupezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_6047346a22ee7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5fcbe3bd39157.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/Fgf9hbO/suvozoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/gjhcbve/1434290807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5fe81f8d8e79c.pdfIn PDF document text
    • https://cdn.sqhk.co/lewuravasu/fmnbjdh/637092235.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/limeroad_offers_bed_sheetsdpcpx.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/ij9QqYa/local_nightclubs_in_las_vegas_open.pdfIn PDF document text
    • https://lebivituwaw.weebly.com/uploads/1/3/1/8/131856954/mepuwefozoleto.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/4ba67e4284a13.pdfIn PDF document text
    • http://naturebiolog.space/what_does_the_word_transcendental_meditation_meanbrzvk.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/fixidoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492253/normal_60120c0026950.pdfIn PDF document text
    • https://vokidasurodetax.weebly.com/uploads/1/3/6/0/136089353/6a8d64ba.pdfIn PDF document text
    • http://kpupnov.pro/setafaniwuvixepariegwq4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_052f8373efc842dfb54982f9d02b0787.pdf?index=trueIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_265826f4b5d2473eb85fa73123010bd1.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_8c7e7f84c01f4db281d0587d7fd7bdf1.pdf?index=trueIn PDF document text
    • http://womawujun.atwebpages.com/business_analyst_courses_canada.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_6e9bbfa73c454ed78c78cd616c820e94.pdf?index=trueIn PDF document text
    • http://dufojamimusim.atwebpages.com/how_to_chart_weight_loss.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_off0001b64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B64A 39772 bytes
SHA-256: 68ab5c1150807d9222d71fb8f5e57681819761889bb46035dc26b8412ec51a70
font_01_sfnt_off0002308d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2308D 5644 bytes
SHA-256: cd7b61e5393ddf45d1f051c19a501108e982bc2834254cdace401eae8a99eacc
font_02_sfnt_off000243c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x243C2 14084 bytes
SHA-256: bbc7458cd6db9368ca49281aa032190df4c2734830a97be53c3dc763ae2cf119
font_03_sfnt_off00027199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27199 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e