Malicious PDF — malware analysis report

Static analysis result for SHA-256 833a699e473543af…

MALICIOUS

PDF

98.4 KB Created: 2021-03-22 07:19:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ae862596589afb0b74228257c2994390 SHA-1: 1a5cb222936ce053656d286b973d83ce5cae8526 SHA-256: 833a699e473543af387836421b531a6dbc41fe3d95e5220752222cf93fa69f12
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The PDF structure itself, combined with the embedded links, suggests an effort to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/award?keyword=libro+poemas+de+mario+benedetti+pdf PDF link annotation
    • http://triple-doska6.club/nakuvok1hxwp.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/iaggija/electricity_meter_reading_mobile_application.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_602ae10f524c5.pdfIn PDF document text
    • https://cdn.sqhk.co/xanovika/4Z7Oig1/63341819016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5fcd8b52c293c.pdfIn PDF document text
    • http://lessonsonline.site/kemiwenodufewapov4bmf1.pdfIn PDF document text
    • http://pannochki-art.com/214725871005b7rq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476596/normal_5ff11429a8de8.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefoveniri/gcjbwa5/hey_mama_song_free_starmusiq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411481/normal_6016faa5285fe.pdfIn PDF document text
    • http://hangookoil.ru/astrix_la_fille_de_vercingtorixqyhsw.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/RjcnhjK/67509575110.pdfIn PDF document text
    • https://cdn.sqhk.co/bovefonot/jgxgehd/86115826738.pdfIn PDF document text
    • http://reawolt.online/kashi_amarnath_full_hd_movie6togb.pdfIn PDF document text
    • http://goproonly.com/la_llamada_de_cthulhu_juego_de_rolnw50b.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/bZgdEge/rolling_stones_face_mask_article.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/igghUhc/4936092328.pdfIn PDF document text
    • http://salestore.pro/epson_perfection_v370_photo_scanner_manualk0lcy.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/Z0uij4x/truth_or_dare_film_review_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/DCEjj9o/lilimekigotarajebere.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500200/normal_5fdfd3f360f2f.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/xuvamuba/aladdin_2019_ost.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/wevesuwalufuvaj.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_off0001423d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423D 5236 bytes
SHA-256: 2951b2338714610ba1f5afd4a469ca1e672aee18dab1930304da992ea9653f16
font_01_sfnt_off000153f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F0 12072 bytes
SHA-256: 21b22a74334029af832d15810a3eaae90bf0483433e0cbacc553afadf40db200

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