Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ab5f8b885bac69…

MALICIOUS

PDF

80.6 KB Created: 2021-03-29 01:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8d2a10205faebd44ae4a5aa72b956e0 SHA-1: 98de39ed8407fae350e7b62446322f8817183bda SHA-256: f2ab5f8b885bac696c1d06c97df33aac9f4745f87af336b8de6ae46250dff397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=boron+nitride+nanotubes+pdf
    • https://cdn.sqhk.co/zofizitene/xhiQDI4/traxxas_tqi_link_enabled.pdf
    • https://xezixopizanew.weebly.com/uploads/1/3/5/3/135314636/4422305.pdf
    • http://social-whisper.ru/470168753165jaro.pdf
    • https://cdn.sqhk.co/jadepibake/pigYjat/69104024399.pdf
    • https://cdn.sqhk.co/ledodatefu/gcxgcr2/rescue_the_boy_cut_rope_puzzle_free_online.pdf
    • http://boomua.site/dream_holiday_travel_home_design_gamesge2v2.pdf
    • https://cdn.sqhk.co/kedilexele/ibghzi7/relaxing_cruise_lines.pdf
    • https://zegikawa.weebly.com/uploads/1/3/4/6/134640481/muxupapowoz.pdf
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/jobisapimo.pdf
    • https://cdn.sqhk.co/tesadubozino/EChjrhb/mechanics_bank_mansfield_ohio.pdf
    • https://cdn.sqhk.co/sabiwizi/hd0Xjhp/syberia_3_switch_patch.pdf
    • https://cdn.sqhk.co/norowitidot/MjvljiC/download_mod_herobrine_minecraft_pe_android.pdf
    • https://rosojuvawava.weebly.com/uploads/1/3/4/7/134719385/8814047.pdf
    • https://cdn.sqhk.co/wujozuzewed/MhhIUhh/age_of_empires_2_trial_cheats_pc.pdf
    • http://garantiya62.ru/widezawefajewivupofup0dde5.pdf
    • http://vovality.club/windows_7_shortcut_key_for_screenshot6fg04.pdf
    • https://cdn.sqhk.co/xemugugafot/3ufhiUC/sort_it_3d_gifts.pdf
    • http://investmag.org/makusas6zhi3.pdf
    • http://omynutural.space/3903114992806v2k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kinutumuzikuji.epizy.com/injury_report_alshon_jeffery.pdf
    • http://garaloxuvenuwin.epizy.com/reducing_fractions_worksheets_5th_grade.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc25.bin
e94b65a2b62d668129f6be96c8e41ee0fd34a17c013c7c2891c59e140036277b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 5192 bytes
font_01_sfnt_off00010dd8.bin
865c7383e73b724fac14a7684b9082c4bb2df136fd7587bde8e8b00e356c04b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 12120 bytes

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