Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9e91a52bc46e9d…

MALICIOUS

PDF

78.2 KB Created: 2021-03-28 07:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 17c6f323adf68a84845f4a4a76933a40 SHA-1: 6dc4e500a7c4b779a4149a75b98335c89e975efe SHA-256: 1d9e91a52bc46e9d4824ee751cc455a091f96436ffcd01d39ac2e1120e118afc
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs. The PDF contains embedded URLs, one of which, 'https://resalured.ru/award?keyword=ejercicios+de+rima+asonante+y+consonante+pdf', is flagged as a potential lure. The document body is heavily obfuscated, but the overall structure and heuristic firings suggest a phishing or malware distribution attempt.

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
  • 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/award?keyword=ejercicios+de+rima+asonante+y+consonante+pdf PDF link annotation
    • http://nunesop.scienceontheweb.net/7394565945.pdfIn PDF document text
    • http://wuwudikosegukem.mypressonline.com/string_theory_simplified.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/uwHiDgg/jungle_survival_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/hhslgjf/chiari_malformation_mri_findings.pdfIn PDF document text
    • http://koxivesuvif.mypressonline.com/melex.pdfIn PDF document text
    • http://sejujanovemo.medianewsonline.com/franais_anglais.pdfIn PDF document text
    • https://cdn.sqhk.co/bubesuzax/p9hjWsM/kujetunanupafapuziwov.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/fisher_honey_bear_wood_stove_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/icmhgxa/download_storyart_mod_apk.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/b121e1d9-fdfb-4fcf-b24e-e4f04ef402c5/interview_questions_for_hr_administrator_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e0d563-52e2-42d5-8160-9929e8f5641d/10963012187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a6ae9c-c173-4cab-97a4-c0d0700327ef/14902865749.pdfIn PDF document text
    • http://jekurur.atwebpages.com/a_1240ss_as.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e970ae6-98d1-4909-8b6f-cdd48437d2dc/pazeja.pdfIn PDF document text
    • http://meluromotav.rf.gd/22974466229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb12a09c-9b67-46b5-ae76-efa3a67857f8/jagojetakazosawatim.pdfIn PDF document text
    • http://pejonoma.epizy.com/efi_bootloader_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/686dd83f-8686-464b-aa0d-605f09cf1ff8/nesco_american_harvest_food_dehydrator_and_jerky_maker_recipes.pdfIn PDF document text
    • http://bitujiduruv.myartsonline.com/how_to_learn_medical_billing_and_coding_for_free.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_off0000f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 5404 bytes
SHA-256: 590688fa603eb1dd07ab68f0cad4f478ee404c6de58151978d90f4042c46773e
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 11804 bytes
SHA-256: ef5ef53324c82ebce6bca47457e1686b852c6dfe9cf835ff01bd628698b4d4f7

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