Malicious PDF — malware analysis report

Static analysis result for SHA-256 820c98d8716fabe0…

MALICIOUS

PDF

79.1 KB Created: 2021-03-25 17:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b12431531496be01e2a97cd5998288c8 SHA-1: baa05618ed6229ef6a5369a961f9d8f596c5991c SHA-256: 820c98d8716fabe0bd8c166834793f5f42d098df3118f7652a6cd50552e71db4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=rayovac+6v+battery+charger+blinking+red+light PDF link annotation
    • http://pixelbarista.com/how_to_sew_a_simple_face_mask_with_pleats8hn7z.pdfIn PDF document text
    • http://shortsomfj.space/mary_poppins_book_is_not_its_cover_lyricssjxfh.pdfIn PDF document text
    • http://mavitrade.com/kowasikusumedoginimevp5m9a.pdfIn PDF document text
    • https://samaruwopag.weebly.com/uploads/1/3/0/7/130738554/7436492.pdfIn PDF document text
    • http://ca-management.website/670383557q2bxw.pdfIn PDF document text
    • http://slmit.space/what_is_a_rule_12_hearinghoiqk.pdfIn PDF document text
    • http://o-karte-kopilka.com/87428392328caaab.pdfIn PDF document text
    • http://komarovskii.xyz/letuzebuvupid0xz4f.pdfIn PDF document text
    • http://about-igsupport.com/98366953453z8ttl.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/60906104268cov7m.pdfIn PDF document text
    • http://wurijudopala.22web.org/what_books_are_in_the_hobbit_series.pdfIn PDF document text
    • http://sberpodarok2020.online/bteup_result_2015_marksheet3h3a8.pdfIn PDF document text
    • https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/kubowekumikor.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://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_38463c0332d645949e85cb9675c6bdd9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/forklift_license_training_near_me.pdfIn PDF document text
    • http://mimumugemefes.epizy.com/45395444769.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/51104873342.pdfIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_40295d2c90c648119e57b33dc7d69865.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/riot_point_codes.pdfIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_ca6ab5539f814daea841c9b7bb0b37f9.pdf?index=trueIn PDF document text
    • http://dibulazovila.rf.gd/14061083483.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_2aea644c53ca4e83a7329a6a669a9ef4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 5340 bytes
SHA-256: b8671dda55f00a34dcd16c4219aae9f922dfb01df632222befdacbc08658b5b4
font_01_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 11736 bytes
SHA-256: 102ae472536e8081ff4fadab70061c2fc34069a55324725c9b5d7a975536720f
font_02_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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