Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a63ac335c13bd2…

MALICIOUS

PDF

103.2 KB Created: 2021-02-08 18:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 485676b0b3d404d12212ddc5326db089 SHA-1: 2e95d4854869a565437d282d34f9a2f572a466d1 SHA-256: 21a63ac335c13bd2b5d2794fa2d7c9b14886d99165a99ad2a4e1412f2a26d591
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to suspicious or unknown domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is weaponized to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=vba+excel+2013+tutorial+pdf PDF link annotation
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/puvotagosubon.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/vevakopeveduse_risobutizuvogiw_serimiw_binizemidul.pdfIn PDF document text
    • https://cdn.sqhk.co/rowavarop/2PidhbS/nazujivubakavazarakurogu.pdfIn PDF document text
    • https://nazokorebuvawir.weebly.com/uploads/1/3/0/7/130776058/c3b2a2801.pdfIn PDF document text
    • https://cdn.sqhk.co/xujutitula/hfkieL2/man_down_movie_trailer_song.pdfIn PDF document text
    • https://rotolakudezi.weebly.com/uploads/1/3/4/0/134041133/vatibuzusegujazegafa.pdfIn PDF document text
    • https://fodubimofo.weebly.com/uploads/1/3/4/8/134884763/zunafoxomenitiwatiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_601704d7c9020.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/qZhcjSp/city_racing_3d_mod_apk_download_for_pc.pdfIn PDF document text
    • https://nakakikixug.weebly.com/uploads/1/3/4/4/134490848/92f81.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/bokexizometun/veterinary_icu_flowsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/85478687836.pdfIn PDF document text
    • http://kutuwawelozekot.rf.gd/amar_ujala_e_paper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/79980936706.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/57777791664.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC7 5632 bytes
SHA-256: ed690cb03219362c8cdf5a3894799ff276890024d63e6005f6de3ddac2009800
font_01_sfnt_off00015206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15206 12100 bytes
SHA-256: f6d48f63c7630709ba6caf531811684f4c4187c1fd9000393910bb11b64fdb50
font_02_sfnt_off00017934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17934 16620 bytes
SHA-256: 56984dffa847ceb411f09b2155e8ee4ecf05eec5abe50b6740f0081f8de359ff

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