Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c1ab66fc65d5b7…

MALICIOUS

PDF

74.7 KB Created: 2021-02-18 13:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f257a0d616ce62dec6988ccc21a60d72 SHA-1: 2045ccce4e3292e72cb62bc3f82bcccf02484fef SHA-256: d5c1ab66fc65d5b744c65a0dcb72931c748cf6fcff42e1b5ca6d1312e1660550
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to the PDF creation, and the presence of numerous links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=cortisone+shot+in+right+shoulder+blade In PDF document text
    • https://cdn.sqhk.co/remimidotomi/cdmjagj/mvp_hockey_cards_value.pdfIn PDF document text
    • http://pelososone.22web.org/rorokesowaduvanawetaji.pdfIn PDF document text
    • http://shopsmmv.site/aha_hypertension_treatment_guidelines_2019t7n26.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/QVgbLhe/wugatorusunoruj.pdfIn PDF document text
    • http://jokebixa.22web.org/european_commission_competition_vertical_guidelines.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/joola_ping_pong_table_touch_up_painthmi9c.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/eB8OCjd/wavifijulasatunagivaf.pdfIn PDF document text
    • http://fikodon.iblogger.org/jurejodidobadexenuwusuwum.pdfIn PDF document text
    • http://basepati.22web.org/cover_lagu_cantik_tri_suaka.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/gXlJCBj/bandpass_filter_circuit_breadboard.pdfIn PDF document text
    • http://itdiscount.info/game_android_support_gamepad_2017spvbg.pdfIn PDF document text
    • http://klosheff.xyz/super_dragon_ball_heroes_world_mission_arcadezsi5e.pdfIn PDF document text
    • http://tufepuwaw.iblogger.org/qu_es_el_movimiento_circular_uniformemente_acelerado.pdfIn PDF document text
    • https://cdn.sqhk.co/wabedamor/jZlM3jc/wikiriwowufap.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/jaibjhP/80205324352.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidexegope.epizy.com/childhood_russian_song.pdfIn PDF document text
    • http://relurifiluxel.epizy.com/adobe_acrobat_pro_windows_7.pdfIn PDF document text
    • http://woxanegerofokox.rf.gd/66627476630.pdfIn PDF document text
    • http://situbepid.epizy.com/lace_long_sleeve_bodycon_dress_black_missguided.pdfIn PDF document text
    • http://fujebudavitasoz.epizy.com/davis_drug_guide_senna.pdfIn PDF document text
    • http://dijiwag.epizy.com/rsos_form_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 5132 bytes
SHA-256: 1168de9ecc786384ceff865c21fd3647cc3d0bc5aa8f20b20dda3121fb929460
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 10164 bytes
SHA-256: 1a8968fb8adc38ef2e06d9056eef43128722ac7829132ef5b5c1dca2b7494bdc

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