Malicious PDF — malware analysis report

Static analysis result for SHA-256 2530406543dde4cc…

MALICIOUS

PDF

73.3 KB Created: 2021-03-02 04:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 46e397db6cdf3b5e6880d7d549b666d8 SHA-1: 83422943dea98052071df17a6353e1696db961af SHA-256: 2530406543dde4cce5eef14984a0288bbfeaea62fb920f1378221165154cd31e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, hosting numerous links to external websites, with one specific URL being a potential lure for 'procreate app for ipad mini 2'. The presence of embedded URLs and the link farm behavior strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wb?keyword=procreate%20app%20for%20ipad%20mini%202 PDF link annotation
    • http://vizionsmc.net/aruvam_tamil_movie_tamilgunidx3h.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/hjF1Hhi/bored_chat_rooms.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/GHif0hc/12693150587.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/88948878799.pdfIn PDF document text
    • http://glasshookahcatering.com/kogopirumimuramubonofij0d.pdfIn PDF document text
    • http://baffer-shop.space/40016986557nm970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476954/normal_5fde61ab61bd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_6014dd81a7c7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446765/normal_5fdc9b154439d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fc58529bcf8d.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/75174280852.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/unique_baby_girl_names_starting_with_c_with_meaning.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/nirekuxofazavawojai5r2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lomonejezatixow.rf.gd/what_is_the_average_step_1_score_for_specialties.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/br_shafi_latest_videos_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/94823341685.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/roomba_battery_reset_procedure.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/dividing_integers_practice_worksheet.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_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 5224 bytes
SHA-256: 51dcd45fb38785e090705f15ba9d3c40fe06896b6ec0a14d2527cd07668e4adc
font_01_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 10840 bytes
SHA-256: 1a0c0a3831ddab1fc3db6e27d64c312c3a1d54d559ed1aece2dacba5d691b496

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