Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37c109792c2ed5d…

MALICIOUS

PDF

74.6 KB Created: 2021-02-16 18:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cf36b50fdd806b13a770ae4c590e9565 SHA-1: 44c808618d5a36fa6e44e44b647bc0f906a09b2d SHA-256: e37c109792c2ed5dd21665097c196fb84fd21767a5db1169dcee388ba5aee211
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or malware distribution. The embedded URLs, such as 'https://leonvi.ru/strik?utm_term=peace+like+a+river+hymn+chords', further support this, directing users to potentially harmful sites.

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=peace+like+a+river+hymn+chords PDF link annotation
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/6275072.pdfIn PDF document text
    • http://mini-cam1.club/vazikikovogurasaborawedomldham.pdfIn PDF document text
    • https://rinavupitaf.weebly.com/uploads/1/3/1/1/131164375/31469db36622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5fe80503dd6ff.pdfIn PDF document text
    • http://raisinshub.pro/propanoate_d_thyle_formule_dveloppecca2m.pdfIn PDF document text
    • http://tamakar.tech/pottery_barn_outlet_joliet_reviewsu1hte.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463825/normal_5fd64a044fdf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404296/normal_5ff919516cb29.pdfIn PDF document text
    • http://load-bcp.com/nepesebugunokirufuzajcgjx.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/handbook_of_livestock_managementfzwxx.pdfIn PDF document text
    • https://denagivar.weebly.com/uploads/1/3/1/3/131383646/kikixan.pdfIn PDF document text
    • http://brettlockhart.com/the_girl_next_door_movie_ending_songjj7p1.pdfIn PDF document text
    • http://domsale.xyz/labuvizagajs30xt.pdfIn PDF document text
    • http://natbeach.space/pimorerewiwolaxabubezuduw4szd.pdfIn PDF document text
    • https://satalediveli.weebly.com/uploads/1/3/4/0/134018026/govaveri.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/fotabesimefa_tenesadodu_getawuro_lonep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457876/normal_601be1fca5950.pdfIn PDF document text
    • http://info-pages.ru/xazigisojipejeredelobewilb80x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 5116 bytes
SHA-256: 2aa3c39a9e696ac446aa61c9a60d7ffb271f7c023b1091d227e1e6126e1b34a9
font_01_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 10484 bytes
SHA-256: 65c737339bacbce3fd8dfc046258b25d95dd4a6defe7e343c32c7a4663f15935
font_02_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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