Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bba0f418cc6d3a…

MALICIOUS

PDF

83.2 KB Created: 2021-03-18 12:21:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ab19e2a4cac1d6f01aa433353f5a22f0 SHA-1: c441218a76122f0195bff4ad1b76d95fe316593a SHA-256: a7bba0f418cc6d3a534b7e114b47354bdcafe4d96fc35e764fc7df13b554be3a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/aws?utm_term=troy+bilt+horse+mower+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389358/normal_5fcbf064e8c7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465539/normal_5fdecaf04e5d9.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/a_table_alphabeticall.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446765/normal_60061a79c1e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_600e9827b778d.pdfIn PDF document text
    • https://pitamiled.weebly.com/uploads/1/3/4/0/134098016/teguko.pdfIn PDF document text
    • https://tanoviruxejalun.weebly.com/uploads/1/3/0/7/130775892/kunamom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_604ba146d1b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490365/normal_5feaeeced8eb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489056/normal_6039768469370.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412413/normal_5fd04e560bfed.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/what_is_the_most_profitable_business_to_start_in_2020.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/7534973.pdfIn PDF document text
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/4334629.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_b341ea7610eb42a6a5f7fd1bfaf52d49.pdf?index=trueIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_ea07a56a8f794f71aa4540a8c621a879.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_4067bef867e14820b1733ad298c83b01.pdf?index=trueIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/what_are_the_5_dynamics_of_dance.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 5208 bytes
SHA-256: dbf7be02add55bc052c18492d9c79ffec693783f0814f4efc195ea6c8f269807
font_01_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 12576 bytes
SHA-256: 6a92c1a894e259328188ca30cc4493b192f7926d1fdbf6f8c87f5d986fb25413

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