Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7818b0136e2573…

MALICIOUS

PDF

68.3 KB Created: 2021-06-07 11:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed1245dd54868c84303b50e03bae3173 SHA-1: c3080e962b2d451b885aa7387ac31a6c7966ccef SHA-256: ae7818b0136e25737f67ffd719bcdbe2e3e45e5c0cd549d2ed585f1457253025
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or spamming operation. The primary URL, 'https://infrive.ru/pbw?utm_term=what+is+the+latest+version+of+summertime+saga+for+android', is presented in a way that mimics a search engine result, aiming to trick users into clicking it. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing.

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://infrive.ru/pbw?utm_term=what+is+the+latest+version+of+summertime+saga+for+android
    • https://cdn-cms.f-static.net/uploads/4486748/normal_5fd09facc53e9.pdf
    • https://static.s123-cdn-static.com/uploads/4408460/normal_60058079b6f6c.pdf
    • https://cdn-cms.f-static.net/uploads/4475217/normal_600bf3fb5be96.pdf
    • https://static.s123-cdn-static-d.com/uploads/4409630/normal_60b21d894fca9.pdf
    • https://cdn-cms.f-static.net/uploads/4408461/normal_60610e651d0b2.pdf
    • https://cdn-cms.f-static.net/uploads/4530070/normal_6025729fa7b5b.pdf
    • https://cdn-cms.f-static.net/uploads/4455669/normal_6041d10a7c324.pdf
    • https://static.s123-cdn-static.com/uploads/4446394/normal_5fd059ad29729.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144411585/zurudilufobalapabowu.pdf
    • http://zeladejan.pbworks.com/f/how_to_tell_if_injection_pump_is_bad.pdf
    • http://puzavofan.pbworks.com/f/91016963099.pdf
    • http://gapufipi.pbworks.com/f/oklahoma_drivers_manual_audiobook.pdf
    • http://barotidi.pbworks.com/w/file/fetch/144625845/fobitugolewumovuzupeze.pdf
    • http://mibegenav.pbworks.com/f/identifying_parts_of_speech_in_a_paragraph_worksheet_with_answers.pdf
    • http://rimikupababo.pbworks.com/w/file/fetch/144534741/75227345682.pdf
    • http://lopofemusun.pbworks.com/f/vagozoj.pdf
    • http://tuvovazuvezo.pbworks.com/f/refosaf.pdf
    • http://lekuzax.pbworks.com/f/s._rogers_and_m._girolami_a_first_course_in_machine_learning.pdf
    • http://zubipuwaf.pbworks.com/w/file/fetch/144518946/pokemon_in_hindi_episode_15_season_2.pdf
    • http://bezagodo.pbworks.com/f/cobra_kai_review_rotten_tomatoes.pdf
    • http://jutifakukap.pbworks.com/f/office_para_windows_7_ultimate_32_bits_drivers.pdf
    • http://polujare.pbworks.com/w/file/fetch/144733638/97431363647.pdf
    • http://niluputevi.pbworks.com/f/33024646691.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce96.bin
46a393022e33257080f9603056467400dce1bed2e5e22078004c71c06cd13a6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 5396 bytes
font_01_sfnt_off0000e0d3.bin
af7cc30e96c9bb35dcf41fe2997580c9c3f42ccd75cb0e803d4457f36cbb0483		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 10208 bytes

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