Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4668520e2423db7…

MALICIOUS

PDF

85.5 KB Created: 2021-02-27 13:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8cc81792046141e3944634c4095bef8d SHA-1: 7974c4bf61d3a008b5e80897538c5ce05e8b8407 SHA-256: c4668520e2423db7881ca774db2688c3ad7071fb5e361d0f5127c3a8cd3c9998
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign, likely serving as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=britax+advocate+clicktight+airplane+installation PDF link annotation
    • https://cdn.sqhk.co/bebuvasipen/jewifhb/15871628112.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/medarebisepipuwedafumax.pdfIn PDF document text
    • https://peniseguj.weebly.com/uploads/1/3/2/7/132712198/2928398.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/diziagh/minecraft_world_edit_commands_download.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/ngc9gem/22665057270.pdfIn PDF document text
    • http://lojasamericanasbr.com/saleebi_jang_in_urdu7ejal.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/jbWCwjg/freakiest_songs_2019.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/english_grammar_in_use_elementary_fifth_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/qihhjgf/99230079565.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/academic_linking_words_and_phrases.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/sjfURzL/pull_pokey_ball.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/how_to_make_toga_himiko_in_gacha_life.pdfIn PDF document text
    • https://cdn.sqhk.co/mikujudo/9sjaMXn/87427010992.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/jejulurowev/rudolf_steiner_lucifer_et_ahriman.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/17867906361.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/flight_centre_travel_group_annual_report.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_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 5576 bytes
SHA-256: f390e123d5d4ea637c88575d77102821f74ca2745c69e22f3ffe859bb6767022
font_01_sfnt_off00012398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 10752 bytes
SHA-256: 0e37da685c20185fae5a8689ebfc435f71840438d38d73745a8893da1840ff5b

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