Malicious PDF — malware analysis report

Static analysis result for SHA-256 778a28d74cd875f8…

MALICIOUS

PDF

89.9 KB Created: 2021-04-05 03:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 668fb162a9c92403c09b45eb040ec6e7 SHA-1: 51f7ca07f2c6bb9ff593ea078bf1c66e99f3a078 SHA-256: 778a28d74cd875f80b30ed97419d039546637f52a49ffba6aef0dec5b54d2e00
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/aws?utm_term=maha+satipatthana+sutta+in+hindi+pdf+free+download PDF link annotation
    • http://sibuvre.com/the_art_of_choosing_sheena_iyengar_free_download1pnde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443325/normal_60254ae62cc45.pdfIn PDF document text
    • http://4338bacchus.com/text_message_png_icon1t77t.pdfIn PDF document text
    • http://indital.fun/genafewiwaxaxogimebosomc7slv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5fe95c5bd24e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_603333c342394.pdfIn PDF document text
    • http://center-san.ru/83694528123wq0bh.pdfIn PDF document text
    • http://xsale.trade/hp_beep_codes_2_beeps_red_light75lhu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_5fdab349a1aff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/how_to_assemble_ab_lounge.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_cc3526495d7f48e9ac5dfa3c9157928b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/wabopinubet.pdfIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_ab131ca92b4f4992b0db928d62132830.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/how_to_find_dividends_paid.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/bubozasuzudokutaliza.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/former_basketball_player_with_aids.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/64385419011.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/62044561175.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_c83e2a3625974d20bebf2c38327bb996.pdf?index=trueIn 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_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 5224 bytes
SHA-256: ec42f2b172e05679c3a45d6bba45b09d166d3785ae1a81313953308cdae506d6
font_01_sfnt_off00012ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFD 12360 bytes
SHA-256: f45516e6378810951e0045aec681a5aaec5ab749368b9c08b4a8af20a8d2ea64

Open this report in the interactive analyzer, or submit your own file for analysis.