Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f760b58eac4410a…

MALICIOUS

PDF

76.0 KB Created: 2021-04-04 22:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 089c5f59e529a364bdd8840f6876f09c SHA-1: df1770ffd97fe48a6e5d7ba55140bae14d7ee95b SHA-256: 6f760b58eac4410a9e38ecec494229644ab09bdb681e1878ff73f8f76d99ac56
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'building construction checklist'. The presence of external URIs and the ML classifier output strongly indicate malicious intent, likely for phishing or to serve a second-stage payload.

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://nipisod.ru/award?keyword=building+construction+checklist+pdf PDF link annotation
    • http://nofubajabuv.medianewsonline.com/satisifowugofupanalesi.pdfIn PDF document text
    • http://llloooodddd.space/30043725356tulzo.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/the_wifes_lament_poem_annotation.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/13908359300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_5fd6cae498924.pdfIn PDF document text
    • http://persequen.com/jebokoxokafabigozegexifepgj1be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_5fe82d2f96a70.pdfIn PDF document text
    • http://comp-arenda.site/fonepaw_for_android_2.9.0_registration_codel6vtg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fdf0206a4ee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_6060f21e4a6dd.pdfIn PDF document text
    • http://tpdreport.com/how_to_connect_roomba_to_wifi_5ghz8910m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_5fdad4c572f2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiwujugisijema.epizy.com/77808634049.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/book_8_test_3_listening_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/old_school_cars_for_sale_under_2_000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0d81c3-122b-4830-bb15-8802598af33f/penny_stocks_to_watch_dec_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d76ff78-1504-495c-80b9-e485a4a566d7/hounds_of_baskerville_movie_download.pdfIn PDF document text
    • http://tujukiji.rf.gd/reporter_amharic_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531e4f1d-fff3-43f0-b476-efe6252b109e/which_is_the_best_sewing_machine_singer_or_brother.pdfIn PDF document text
    • http://nexopuvesoreben.epizy.com/world_press_photo_en_mexico_2014.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_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 5320 bytes
SHA-256: f226bf46dc48087a9ffe40e5935924af7cfb31af0040bbc100b80fd4bdb0532e
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 10428 bytes
SHA-256: bd7db46c2c1a1a904363f4921bd41e9f4661fb784b53f7c16f1ea31e5448737b

Open this report in the interactive analyzer, or submit your own file for analysis.