Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e7923b6b63d2d6…

MALICIOUS

PDF

70.4 KB Created: 2021-03-09 18:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d1dc884aaf780fd0692b4ed317590bbd SHA-1: 3d3e4f9831b14a1192f6dc3ac0348b358dc8f138 SHA-256: 42e7923b6b63d2d67fbb884ef49e3ea00150901706d6e390c297cbe3e32d707e
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or redirecting users to malicious sites. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://resalured.ru/123?utm_term=teacher+guide+connect+plus PDF link annotation
    • https://cdn.sqhk.co/bofimekowadu/5Khfjgg/5382454363.pdfIn PDF document text
    • https://cdn.sqhk.co/duzupafuj/Yloxfs1/tamil_lyrics_video_maker_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_601cb6b013778.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/Bifjjhk/gibekesizazanobagove.pdfIn PDF document text
    • https://cdn.sqhk.co/lowimipofevu/hSWiciD/shark_evolution_script_pastebin_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/6ZhdTUX/real_boxing_2_creed_mod_apk.pdfIn PDF document text
    • http://gareduli.22web.org/como_reportar_incidentes_laborales.pdfIn PDF document text
    • https://cdn.sqhk.co/xolizoxime/R0OoYys/jepaxexi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470535/normal_5ffaccf49c85c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481157/normal_5fe0bef486576.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/jhRD6gj/88001684236.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/bhgihia/bewigobikotagepasotev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491945/normal_5fe401628440e.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/eMjfgjz/51159384264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_603c4ae913eb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_4d62132d899747939f55e88c9cb0c178.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_3dbb49ca6ae945b3a44a5ba0884b5314.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af97d15-495d-43aa-94a7-64df60972b44/46506076400.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_e33eb5210cd54604a25f0407ba4a7198.pdf?index=trueIn PDF document text
    • http://fabotiwes.rf.gd/marginal_rate_of_substitution_questions_and_answers.pdfIn PDF document text
    • http://nawonarubital.epizy.com/betis.pdfIn PDF document text
    • http://sisuraregimu.rf.gd/airlines_manager_android_tips.pdfIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_0ef54857c6244985b093599b1b3eeab6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33b9bec-d7bf-4511-9933-4093190b6513/44089037399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb25a735-d93c-44b1-85fd-3f7349d60ffc/android_programming_for_beginners_-_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6776216d-b9ec-4736-9fc7-28b5db1839f0/samsung_galaxy_on7_prime_price_in_pakistan_whatmobile.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_c2f871b4229c4cf1af3b9f2517b49e8a.pdf?index=trueIn 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_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 5284 bytes
SHA-256: 48b0600d809754fd98a411774b386adbee9ea0b83c3c974a9659d6c498497aff
font_01_sfnt_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 9880 bytes
SHA-256: 52211784759ad9035058a53abb661c47383af0c59f88e0ba881ad760ef64edbd