Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a0e3fa332fd315…

MALICIOUS

PDF

82.8 KB Created: 2021-03-28 21:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c5aeb27ddc33f1409be56598dd7bed61 SHA-1: e26ea15c6e8f5cba61ddb340271b97d6c2f25ea9 SHA-256: f8a0e3fa332fd3157e7ece15ca35b01b58dcbc8835bd66ad2b0caf477f778575
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://jumiwimov.ru/wix?keyword=utorrent+apk+android+4.0.4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417406/normal_605a0c2bdc1f0.pdfIn PDF document text
    • http://fruit-citrus.space/mutawazajebuksoqa.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/ZUvOijv/ghostrunner_xbox_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_60233a96c9d81.pdfIn PDF document text
    • http://rukofuvifoti.22web.org/32873074144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_6058687eedcc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_5fd8ba4d316a1.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/SoYjgj1/lenovo_smart_clock_user_manual.pdfIn PDF document text
    • http://pixelbarista.com/home_paint_colors_applvpwg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423428/normal_5fec3d89aa470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_605f8a040111d.pdfIn PDF document text
    • http://lotsmen.com/the_importance_of_being_earnest_quotes_about_societyc6it8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388842/normal_5fef8aceca0bf.pdfIn PDF document text
    • http://clientesdkb.com/geographical_location_of_nigeriatsm2m.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/ahiegjn/zuvudofuwepage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467576/normal_5fcb63a528d5b.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/aheJQid/xajilenoxitakuvume.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365580/normal_5ff5f9a740ae5.pdfIn PDF document text
    • http://kittyplay.online/movie_maker_2012_free_download_windows_100ha8x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_605bf0a6695b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jirudef.epizy.com/astronaut_hd_wallpaper.pdfIn PDF document text
    • http://zuxeretufem.rf.gd/amide_formation_conditions.pdfIn PDF document text
    • http://xotepugiz.rf.gd/dewalt_xr_circular_saw_manual.pdfIn PDF document text
    • http://jawigunomuj.epizy.com/pevupa.pdfIn PDF document text
    • http://waverotefiwob.epizy.com/panufunimixopajusepuda.pdfIn PDF document text
    • http://wazikaje.rf.gd/pexoparoj.pdfIn PDF document text
    • http://wowulikuvej.rf.gd/bruce_lee_songs_download_320kbps_atozmp3.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 5060 bytes
SHA-256: 69f143601e8f83f7aadfbeaa1d75b23c0bb324e6f73974185f34e6e9f6f74131
font_01_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 12244 bytes
SHA-256: 1bb54cd4fe24df7c826a99dab5f6de2df162be9055be3008b825deec00373fab
font_02_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf