Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b77c5881bc85cd…

MALICIOUS

PDF

91.8 KB Created: 2021-05-10 20:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c8d273dcaebd146ab8d3beff3241268f SHA-1: 8881bdd3952d6c4fb6a69894d563eefa6cdc31c9 SHA-256: b2b77c5881bc85cdfd278eb16efef03e27af3ec6318dad71199ef3e364646e81
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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
  • 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.
  • 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=watch+the+selection+usa+online+free PDF link annotation
    • https://cdn.sqhk.co/xezafube/haIQm6H/60432713783.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/iijbje0/55391391076.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/Bjjjgih/13646342724.pdfIn PDF document text
    • https://cdn.sqhk.co/dakizenewa/ehf0hfq/great_war_photos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453105/normal_606dcd905f834.pdfIn PDF document text
    • https://cdn.sqhk.co/zofukumane/T5Ziglj/better_word_for_master_of_ceremonies.pdfIn PDF document text
    • https://cdn.sqhk.co/pelebitebi/fHhbjiW/gujasonagon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_6060bff836168.pdfIn PDF document text
    • https://cdn.sqhk.co/wokiwife/rhdijhj/60054854080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479446/normal_606d95fe72f5c.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/j8OgjdX/3474810469.pdfIn PDF document text
    • https://cdn.sqhk.co/tezuzerise/IaiiijB/soccer_world_cup_winners_by_year.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://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_5f992c62301548e79ab02247fc844e5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gewisetug/physics_lab_report_conclusion.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/88470665821.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/little_house_on_the_prairie_episodes_season_1.pdfIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_12a5b908dae14432b971f125feacf78f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/estero_bay_tide_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/anari_film_all_song.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_off00011b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 4864 bytes
SHA-256: e85fc3543ce978d767d6b29d6dc052f567a0699bbebdd15c9cdd5fa241e79a34
font_01_sfnt_off00012beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEB 11700 bytes
SHA-256: c65a5c88360d1cfe38ba925ad6daaae80d6f75c1b9a380f6679767bef18240bf
font_02_sfnt_off0001536d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1536D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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