Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33b960f964b418f…

MALICIOUS

PDF

97.9 KB Created: 2021-04-04 15:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5d3080a91912bdccb97da601119f53ff SHA-1: b6d71614ad9ab92dc6cf1eaed7c0a4ad064f6bf4 SHA-256: d33b960f964b418f44991709f66d05df70ae85e99917ace7e8f046b5e0159700
134 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, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs and a heuristic firing for a 'download button' lure, suggesting it's designed to trick users into clicking links. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=apj+abdul+kalam+quotes+in+telugu+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490376/normal_60164f3696d83.pdfIn PDF document text
    • https://cdn.sqhk.co/lofesaxudiwo/hcieKic/7471177404.pdfIn PDF document text
    • http://ukrinsure.com/83146075856hxn65.pdfIn PDF document text
    • http://usesalon.xyz/903688734944rwt5.pdfIn PDF document text
    • http://gukevipagopu.mywebcommunity.org/sherlock_holmes_series_download_1080p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407749/normal_5fcc561855d22.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/hvTjazb/jufukiretobidenebu.pdfIn PDF document text
    • http://tpdreport.com/665360283534o1af.pdfIn PDF document text
    • http://titanovyi-filtr.ru/kruger_national_park_1_day_guided_toursoonvs.pdfIn PDF document text
    • http://pornbustyvids.com/dubimiwigetofuzorajenbu526.pdfIn PDF document text
    • http://uber-global.com/240918041116d461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469101/normal_6046c197ef036.pdfIn PDF document text
    • http://phillipen.online/mulekepadevutukiw418r.pdfIn PDF document text
    • http://robot3.site/netebomufubb95ao.pdfIn PDF document text
    • https://cdn.sqhk.co/gonuromabime/4jcidDH/dilomexajaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480402/normal_6067d3c34f18c.pdfIn PDF document text
    • http://robolab.one/34888009747hyj3j.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/iggcDpD/ichoice_smart_pulse_oximeter_ox200.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/pw8iiiV/get_lucky_meaning_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/93364483541.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/28415330638.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/74538094122.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FF 5752 bytes
SHA-256: 46648b1639f8c6f7fe5ddd92c7a0b976f57e5a25199fb98c3a5a9f6fff416905
font_01_sfnt_off00014493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14493 9996 bytes
SHA-256: 88c4375c32f4c4f5acbabbc8021c134662b67c5bd453d5f14b056bfed2ad5ae8
font_02_sfnt_off000166d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D0 5192 bytes
SHA-256: 8ea39907f3852d4a67e715e994193f2f545a1a95fabd807c9f93147c43acc874