Malicious PDF — malware analysis report

Static analysis result for SHA-256 700766b5db56bf0b…

MALICIOUS

PDF

94.1 KB Created: 2021-04-08 00:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 655561fc5a4c1e3d3b7e613933f37972 SHA-1: d6639c3aa58869be801d313acc0c4084b16f322a SHA-256: 700766b5db56bf0ba12968d9edd5fe0cbf9f10847c34c5ce9f295b93b70e1b40
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on a link to `baarspo.ru` that appears to be a phishing lure. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a large number of links pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish users. ClamAV detection and ML classification further confirm the malicious nature of the file.

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://baarspo.ru/strik?utm_term=what+is+health+psychology+in+hindi PDF link annotation
    • https://cdn.sqhk.co/tiwumixe/Vhg4Vii/business_card_creator_near_me.pdfIn PDF document text
    • http://copyright-securityx.com/niferegexifuja85ps7.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/digiland_10.1_tablet_dl1036_case.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/mTpHnhf/how_to_write_a_business_proposal_for_grants.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/tabavupadamolalogog5bl5k.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/diTigid/subaripavuliwuv.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/gonima/rstudio_cheat_sheet_ggplot.pdfIn PDF document text
    • http://lejipuzab.epizy.com/ingersoll_rand_185_cfm_air_compressor_parts.pdfIn PDF document text
    • http://sarovagovoz.rf.gd/biography_of_abraham_lincoln_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/inspection_report_letter_sample.pdfIn PDF document text
    • https://1a413096-4115-453c-84a6-e19f3d0a1e7a.filesusr.com/ugd/4a2d03_f387c242145b48f882bcdc37cf0cffb2.pdf?index=trueIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/vujukexesabajuwifepo.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/80677153098.pdfIn PDF document text
    • http://gugefojekasarul.epizy.com/tencent_gaming_buddy_apk_free.pdfIn PDF document text
    • http://kexomun.myartsonline.com/oxford_english_to_spanish_dictionary_free_download.pdfIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_99635fc665e84007a60dd09b7c66cf31.pdf?index=trueIn PDF document text
    • https://ff102949-4c65-4b7b-925c-ea9a98d885fa.filesusr.com/ugd/7a16bb_93b6a5bf73d14f1e99665dc30de693e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovetijif/bosafufojabawukasuvovezov.pdfIn PDF document text
    • http://voturugivorajop.onlinewebshop.net/54838085464.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 5352 bytes
SHA-256: 349a2ffbc840721766c9672a51e96392637f78eab45993862d3a634898c28db6
font_01_sfnt_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 2624 bytes
SHA-256: 994b61b9c88aa278b396ae24322cc23559a8e34cd911d953f3d39ccf98c85ee8
font_02_sfnt_off0001291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 11324 bytes
SHA-256: 9f8fe01cb6e5925283a17658e849a61f81d062d698f2aec9a2e7a1cb164dca45
font_03_sfnt_off00014fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBE 8112 bytes
SHA-256: 84227e9eb01bc29cdaa4e9ca20d438fb84b289fbfec8c639cc32e0b5aa30c641

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