Malicious PDF — malware analysis report

Static analysis result for SHA-256 018f2d0282f239ea…

MALICIOUS

PDF

71.4 KB Created: 2021-02-16 02:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 901388c4c58958d9896a68cb73c2be1f SHA-1: a1a651e56f8bd6103694e5a29ff810d2c262d280 SHA-256: 018f2d0282f239eadcc12a33189c5af243a11faf66d37ef682b87201e685b767
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which point to known malicious redirectors or are part of a link farm designed to manipulate search engine results. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate a phishing or malicious redirection attempt. The ML classifier and ClamAV detection further support the malicious nature of the file, classifying it as a phishing trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=winter In PDF document text
    • https://femezusuf.weebly.com/uploads/1/3/1/6/131606597/samigoke.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/igQifih/wizujozovovapakefeziwi.pdfIn PDF document text
    • http://topstudy.fun/alfheim_online_game_freeiof62.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/fEyoMkc/super_slime_sam_english.pdfIn PDF document text
    • http://1yamal.space/jelevanepifimewadivexizibrplg.pdfIn PDF document text
    • http://raffle.website/pizopisukatuvopuwonikerxsqh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480886/normal_5ffc90fa357a9.pdfIn PDF document text
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/vavadugugiki_masunusadan_kanireviz_fobipabiz.pdfIn PDF document text
    • https://cdn.sqhk.co/tedisebufen/7hi1iK0/marooned_meaning_in_telugu.pdfIn PDF document text
    • http://poradoit2.site/electronic_devices_and_circuits_boylestady435g.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/xotomisen/full_albums_free_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/street_fighter_alpha_zero_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/58304730724.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/sony_tv_uk_programme_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/84106858502.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/vibisedididizim.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/53054150954.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/22856805192.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_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 4864 bytes
SHA-256: c54aeb557cc5f0c150ef9b4f5817465024863c0816d5002cf2d7831a8ad8c268
font_01_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 10488 bytes
SHA-256: 0b0d792e117eecfdc31b9d1376bbb49dc4c70b688978cb8431df379070a95509

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