Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f87d31749bb431a…

MALICIOUS

PDF

91.0 KB Created: 2021-04-13 01:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2137b6340c22ef771bece9a8bfd9f37f SHA-1: 76ab48e81c9e30158c009d1934677c3427d02bca SHA-256: 6f87d31749bb431ae559e540310f519e8d3d6ae6dd0723f95c0b9c42083241f9
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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/strik?utm_term=quadratic+equation+definition+with+example PDF link annotation
    • https://cdn.sqhk.co/kenalexuvexu/gcRtXhe/1165463042.pdfIn PDF document text
    • http://znakomstva69.space/583000659041g5hg.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/aqmdiib/talking_gina_the_giraffe_2._0_apk.pdfIn PDF document text
    • http://redirunna.xyz/17316025374ykj6o.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/gdKghic/31923975640.pdfIn PDF document text
    • http://info-pages.ru/rhino_band_apple_watch_series_3cby9q.pdfIn PDF document text
    • http://springwin.space/bilusokatiguvisom4kw4v.pdfIn PDF document text
    • http://circus.market/31109757869sfmi0.pdfIn PDF document text
    • http://sexedate69.site/naxizanalobanixupdvxv.pdfIn PDF document text
    • http://like-store.site/75826401400xtfm9.pdfIn PDF document text
    • http://fitness-ital.fun/plastic_cookie_sheet_liner03nua.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/Qjdvcja/99764129793.pdfIn PDF document text
    • http://eurostore.info/toxogiromabun17k05.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/fgieANf/menagefubozibegap.pdfIn PDF document text
    • http://euroshopmn.space/kiss_acrylic_toenail_kitiesiq.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/xafaxotaful/data_science_training_institute_in_delhi_palin_analytics_gurugram_haryana.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/robalijipirelewugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf022352-0f20-40f9-9bbe-40528c7283fb/what_will_happen_to_a_plant_left_in_the_dark.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b0b81b-7c88-46b8-8a05-b5322b7f3c93/misoturodaximoguzolaj.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/97309678438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd493b5-a363-4f2b-b835-844927850731/panasonic_tc-p50st50_stand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f239ed-4168-4a1e-8529-e3930f83ffdf/nordictrack_promo_code_june_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34abbecd-987c-48eb-8cbd-efc28f445293/bombas_de_ariete_hidraulico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52172811-2d7a-43de-a66d-a263802ba0a2/16657032363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e297b24e-47da-470c-9fd0-65a77ab3d803/vlo_elliptique_nordictrack_act_commercial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d73bf18-065d-48e1-96f1-b32ba7dfd167/husqvarna_372xp_x_torq_oem_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/date_sheet_hpu_ug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f48b22-e9ab-4065-ab5b-31251d2f1db2/wemojufewufemobasinin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0ac3ac-028a-41ba-9777-b951e890a08d/solazosulilotepagewaxepi.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_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 5444 bytes
SHA-256: a72939b1689f4308b543bdec4653e50c79922443ad5dc3282bfd0791b401673e
font_01_sfnt_off0001272f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272F 11960 bytes
SHA-256: 91711ad386c3ce2e99dfd52bb2464ccf3bec5cda6ed5082dedb022b362766a67
font_02_sfnt_off00014f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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