Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7bfe961d34b024…

MALICIOUS

PDF

77.1 KB Created: 2021-02-13 19:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 036c8c6c629fa70fb6672859778e7c12 SHA-1: 4489f83f15ad1786682af16a6dbf39c7d2ca86be SHA-256: 6f7bfe961d34b0240939f6c0dc978feb65c51bdf33da97fece141bbff34d348c
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that point to suspicious domains, including one that appears to be a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to Android voicemail passwords.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wb?keyword=remove%20voicemail%20password%20android PDF link annotation
    • https://cdn.sqhk.co/tatidukigag/hbKghjb/impossible_ramp_bike_stunt_tricks_race_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/poxofufiko/eWAsjcW/best_car_jump_start_battery_pack.pdfIn PDF document text
    • http://detonicro.website/kansai_paint_co_ltd_annual_report_20194yad6.pdfIn PDF document text
    • http://gobigs.space/nightside_of_edenbpckl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489848/normal_5ff3e1c5c3eaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_5feb057104eeb.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/ghbLgdV/waveti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_602678c954009.pdfIn PDF document text
    • http://heartcenteredequestrian.com/sezimidetowuvxyt.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/ghbngfx/guitar_hero_rock_the_80s_cheats_dualshock.pdfIn PDF document text
    • http://pimunipimikuvaj.iblogger.org/91028019570.pdfIn PDF document text
    • http://betmoy56.com/bseb_tet_2019_admit_carddjpyy.pdfIn PDF document text
    • http://ndfnasg.xyz/clavister_firewall_admin_guideyd1xq.pdfIn PDF document text
    • http://rawenspant.online/zezijisogozotivogowify61ud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5ff4aff5a4a6b.pdfIn PDF document text
    • http://shoop-ft.ru/foundations_in_microbiology_talaro2z0js.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/cakewalk_sonar_8._5_le_software_free.pdfIn PDF document text
    • http://tanijug.rf.gd/my_photo_clock_app.pdfIn PDF document text
    • http://wazuvit.rf.gd/muniment_of_title_form.pdfIn PDF document text
    • http://xuxixezatazifax.epizy.com/lofinodaxazasifazuri.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_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 5380 bytes
SHA-256: a8d60950aeaa732dcaafc02e70b923fb0fad9d4bcdbc2cae2c3eebca44950d10
font_01_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 10792 bytes
SHA-256: a8865c018ea279ca1e11b2e3750410870bb1c2540c35dc0ff8dcb3ab6501b71d
font_02_sfnt_off000111c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 16084 bytes
SHA-256: ec3df99856320b80d31be116044d17791d5e837c971f8eb354a8c15125ed363e

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