Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c55c2f51b03c8b3…

MALICIOUS

PDF

80.7 KB Created: 2021-03-07 19:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6fdef9fe0bc554402376f9c9c6113888 SHA-1: 19e76aa12cfb6607991246130b11a3451cd313d6 SHA-256: 9c55c2f51b03c8b3d000c9f1571fb16ca7663ed8f71a343453e93f02b9b7b0e9
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 0.9990

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://baarspo.ru/strik?utm_term=acura+maintenance+code+b13 PDF link annotation
    • http://xifamopituwoti.iblogger.org/vilazidemu.pdfIn PDF document text
    • http://tb-films.ru/best_old_school_italian_restaurants_near_meqfo7l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_601ae9a55fbaf.pdfIn PDF document text
    • http://vazaferexadamaf.22web.org/dell_poweredge_r710_bios_download.pdfIn PDF document text
    • http://repair-telefonov.ru/the_ordinary_skincare_guide_for_combination_skinsxeez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408719/normal_5fd8f5c58b61c.pdfIn PDF document text
    • http://webdefilmizle.com/tagerobajijodonarixudiwuwjiz2j.pdfIn PDF document text
    • http://esclub.info/gramtica_inglesa_nivel_bsicoxwxnf.pdfIn PDF document text
    • https://safipeta.weebly.com/uploads/1/3/1/4/131408280/karijef_zufopif_vezetutanofamo.pdfIn PDF document text
    • http://webpost.pro/zevigebe9nmey.pdfIn PDF document text
    • http://mscredit.info/zilugctbc2.pdfIn PDF document text
    • http://letxxnx.org/does_xbox_360_live_cost_moneyfq71w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425487/normal_6035359cb19bb.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/63613305327byw3h.pdfIn PDF document text
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/bonoramudobiso.pdfIn PDF document text
    • http://mx50off.pro/how_do_you_say_daycare_center_in_spanish21o4i.pdfIn PDF document text
    • https://vadiwolor.weebly.com/uploads/1/3/4/7/134737839/xinigegefu-xupepekikosilob.pdfIn PDF document text
    • https://rudorigafeba.weebly.com/uploads/1/3/4/8/134899211/zuriwat_bebupavu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jududupozibuj.rf.gd/oracle_hyperion_financial_management_user_s_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/congo_river_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/zegasafuro.pdfIn PDF document text
    • http://fosisidevafepet.epizy.com/daxipiretowifaxowemagol.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/can_you_use_a_sony_handycam_as_a_webcam.pdfIn PDF document text
    • http://nesitobika.rf.gd/how_to_change_aspect_ratio_on_hitachi_tv.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 5220 bytes
SHA-256: eed27498d7bd411292c75eaf76777a202474cba4be56d2cd436da46fd6f0d8ba
font_01_sfnt_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00010ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 11192 bytes
SHA-256: ebaf7900655e5e2544d822f50c85aebea9efba140f5c905c2c2d6da2b28448a1