Malicious PDF — malware analysis report

Static analysis result for SHA-256 c851d828b37c1fb8…

MALICIOUS

PDF

71.4 KB Created: 2021-03-18 11:39:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 02cb005c4e63225843398931236e1a34 SHA-1: 0c33af011f65937131654eb9b07792455f60b24d SHA-256: c851d828b37c1fb8cbb052db09fd1314afd937e8cee502dc2d824a0366e89916
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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=authentic+brazilian+bossa+nova+guitar+arrangements+pdf PDF link annotation
    • https://cdn.sqhk.co/zoluxoni/ew9IQge/standoff_multiplayer_mod_apk_unlimited_money_download.pdfIn PDF document text
    • http://dipunag.getenjoyment.net/kuvuxezudutonomu.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/fgdicgf/juriporiku.pdfIn PDF document text
    • http://najisemure.medianewsonline.com/how_does_vacuum_tube_work.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_603aff7f069a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_604e8cc4537b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413226/normal_5ff27d44523fd.pdfIn PDF document text
    • http://zekifafeter.scienceontheweb.net/different_types_of_organizational_structures_in_writing.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/gfgcibm/the_chosen_episode_1_synopsis.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/cMK5jdH/kaguvidolevapufipaguboxul.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/how_to_smoke_the_perfect_texas_brisket.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/dhajgxD/emoji_movie_puzzles_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_604b684faf776.pdfIn PDF document text
    • http://viziziziv.mywebcommunity.org/keto_diet.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/31247235724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375509/normal_5ff118512cbfe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/310855af-5ff9-41f7-a889-a25767d6d5bf/wutale.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/75582725128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582a90fd-b806-4edd-80d9-947a590aba8b/ruvojigulijaweledab.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/76609558684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89eb2255-b3b9-4e4e-8091-0f0441a30dde/tc_electronic_hall_of_fame_mini_shimmer.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/fexitalaj.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/86533927317.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_off0000d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 5808 bytes
SHA-256: daa8f2c095265a74f4f5b5bd3d2581cad637a8114885c8d4f5addb976bd5583a
font_01_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 11616 bytes
SHA-256: 16634a4558e7bd85adce0eed9447c671360b624aa564b106e214edbb4d99a8e8