Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a535468a7bc99fc…

MALICIOUS

PDF

81.8 KB Created: 2021-02-27 02:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dba27e56e0882bd75b0a1ecaea7a53a4 SHA-1: ccf718e90666f07593121da30b793a301587b729 SHA-256: 7a535468a7bc99fc596768484f2beef2e9353b9829545a4b083988f806ab9f23
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a Cisco firmware update lure indicates a phishing attempt. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic confirming the intent to host many external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/123?utm_term=cisco+dpq3212+firmware+update PDF link annotation
    • https://cdn.sqhk.co/mogowepuw/y5gggeJ/descargar_mini_golf_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/gjidkch/la_reina_del_sur_season_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5fd799f57a393.pdfIn PDF document text
    • http://wuvovewapug.iblogger.org/2021_mustang_mach_e_review.pdfIn PDF document text
    • https://razomidubijime.weebly.com/uploads/1/3/4/3/134395635/zezijo_mupolafaxevajiw_vavalasevufuv.pdfIn PDF document text
    • http://boputev.66ghz.com/anatomy_and_physiology_visible_body_free.pdfIn PDF document text
    • http://momivegod.22web.org/canon_ip2700_resetter_full.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/fgejiya/run_fish_run_2_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_6023f0b7c410f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_6024caabc20ca.pdfIn PDF document text
    • http://vibigalobonewil.iblogger.org/69809444773.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/Uucghgg/23969201774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405903/normal_5fff49ee49a3c.pdfIn PDF document text
    • http://luferuvijudadof.22web.org/matigogibovep.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
    • https://s3.amazonaws.com/sulasatevirexo/maths_borrowing_subtraction_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/dmrc_metro_map_2018.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_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 5632 bytes
SHA-256: 7e4d0acf780ef65c7355fb84a8fb8d2a24b8487d0bc5274a2fef4cc9a0eb937d
font_01_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 10128 bytes
SHA-256: 50b00fca7480280dd31154fe33b6fe3a1d9e517b93b01c26233de1e921723a45
font_02_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

Open this report in the interactive analyzer, or submit your own file for analysis.