Malicious PDF — malware analysis report

Static analysis result for SHA-256 3546241d4152a395…

MALICIOUS

PDF

69.3 KB Created: 2021-04-17 14:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 538e29bad0e260f14255c8de64252ed7 SHA-1: 790df7a840ce9dc10fa3d52796c7bfa59802ae54 SHA-256: 3546241d4152a3959dae0be37cce071c62513481a7b7c631e6e79659d96aec6c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs pointing to external websites, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to 'Pearson geometry common core textbook online free', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=pearson+geometry+common+core+textbook+online+free PDF link annotation
    • http://mafesilotob.iblogger.org/flower_clipart_vector_free.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/3896600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_602463e56e74d.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/amish_tripathi_raavan_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392191/normal_60064deda9def.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447278/normal_6058843b773de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5fec718819909.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/tidiluxi.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/bUgd4ic/xatetogebuwotur.pdfIn PDF document text
    • http://sumapewub.getenjoyment.net/pumepepag.pdfIn PDF document text
    • https://kemiponoza.weebly.com/uploads/1/3/4/6/134605011/nuxopikafapabejuga.pdfIn PDF document text
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/5652943.pdfIn PDF document text
    • https://cdn.sqhk.co/ziriziwebu/cTiyXUf/sedikozalof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_5fd66e4b7b31a.pdfIn PDF document text
    • https://ponadolofulofuk.weebly.com/uploads/1/3/1/3/131398561/4eca85d2efc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ganetevenovumo.rf.gd/how_to_wind_a_bobbin_on_a_singer_simple.pdfIn PDF document text
    • http://firiwigisu.atwebpages.com/29396989809.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/schengen_visa_application_form_spain.pdfIn PDF document text
    • http://mozutulobiris.onlinewebshop.net/absolute_power_of_questioning_book.pdfIn PDF document text
    • http://wilaroxu.atwebpages.com/caracteristicas_del_aguacate_hass.pdfIn PDF document text
    • http://deroluzotuz.epizy.com/epidemiologia_gratis.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_off0000d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 5576 bytes
SHA-256: a8de09dc86746a9fbd9bfb8324c6cf5cc86cdf09bd795881f60365aa1b5bbd38
font_01_sfnt_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 10128 bytes
SHA-256: 40e7a672a13727f03756ea0a79c891529fe1d23f4533173663ab13293955a9c9

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