Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd0184d7b084674…

MALICIOUS

PDF

83.6 KB Created: 2021-03-24 21:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dba280f58397d92073534712ea2efc4a SHA-1: 5995acc07f22833544f18708d16eb12e445f5e5d SHA-256: fbd0184d7b084674072dd426f61742bcb14caa1245857a6198ed025c187fcf3e
186 Risk Score

Malware Insights

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

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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kuzutuzo.ru/wix?keyword=algebra+18.2+worksheet+characteristics+of+quadratic+functions+answers PDF link annotation
    • https://cdn.sqhk.co/wugolekufo/dPj7jiR/razopalapopetamo.pdfIn PDF document text
    • https://cdn.sqhk.co/xemuxebu/iajakqC/37874497839.pdfIn PDF document text
    • https://cdn.sqhk.co/zopinulepa/aggqhdr/flight_club_chicago_shoes.pdfIn PDF document text
    • http://ctyr.ru/homograph_worksheets_for_grade_3npong.pdfIn PDF document text
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/044fd066db0c3f.pdfIn PDF document text
    • https://cdn.sqhk.co/xekowodu/jTWiiib/football_heroes_pro_2017_coin_glitch.pdfIn PDF document text
    • https://kamojadatuxam.weebly.com/uploads/1/3/5/3/135316538/688c2a75.pdfIn PDF document text
    • https://cdn.sqhk.co/binilafobet/iOjjhdV/guess_the_running_man_korea.pdfIn PDF document text
    • http://white-x.fun/speed_queen_commercial_dryer_customer_servicef6tdi.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/rutuxafudalogoz-sazosobogobeziz-ladujimonutoren-gizatisomegukeg.pdfIn PDF document text
    • https://fokutape.weebly.com/uploads/1/3/2/8/132814024/8889766.pdfIn PDF document text
    • http://womans30planet.com/black_widow_marvel_wikiv62xd.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/yjejh8V/goxugobufotogivuf.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/x9ziamo/6064965862.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xukonakefules/misudunepezelutuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/cap_full_form_military.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/43683354676.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/how_to_clean_magnum_project_painter_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/chamatkar_movie_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/dabarazivafizos.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/45589010668.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/nejovimitovenegopujezo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 5988 bytes
SHA-256: e650efcfe74d28eb2c01730c4c226000bbbe98e8d1c9b0a4edcf5af3bd170056
font_01_sfnt_off00010ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE1 11520 bytes
SHA-256: dab703c4879c2610c4ababaa5e4bb01f5a3599acfadd5b35a0e37bf882897517
font_02_sfnt_off00013212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13212 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333