Malicious PDF — malware analysis report

Static analysis result for SHA-256 413273a42a8517cd…

MALICIOUS

PDF

74.8 KB Created: 2021-03-18 09:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5bc34a5b2c46cda5444ea83e7cf07432 SHA-1: a716b2ffb144cf25795a862b092018a33c8209fa SHA-256: 413273a42a8517cd0770ed43c578d85bc32e86c1f077705214dab8f65abe99df
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malware. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to distribute further payloads or redirect to phishing sites. The document body, though truncated and malformed, suggests a lure related to 'worksheet pdf answers', aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://leonvi.ru/award?keyword=characteristics+of+living+things+worksheet+pdf+answers PDF link annotation
    • https://cdn.sqhk.co/fenogate/cHcogcH/2600._emu_apk_latest_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421474/normal_600030fa7a165.pdfIn PDF document text
    • http://fly-drive.online/what_roku_models_support_xfinity_stream5no37.pdfIn PDF document text
    • http://kemytbok.xyz/zonupivakogidlmj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_601980b34221f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5fefa85aece02.pdfIn PDF document text
    • http://stroymarketmetal.ru/mera_bhai_mera_bhai_song_pagalworld._ioscas6.pdfIn PDF document text
    • http://meetsoda.pro/77850442150pv6hw.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/eihn0CY/18341690450.pdfIn PDF document text
    • http://iminn.ru/what_are_the_problems_in_writing_englishh7658.pdfIn PDF document text
    • http://ukranews.site/when_breath_becomes_air_audiobook_free_download3w53d.pdfIn PDF document text
    • https://cdn.sqhk.co/rufomezin/dEEgwhh/nubs_adventure_apk.pdfIn PDF document text
    • http://boevoenlp.com/listen_to_the_book_of_enoch_online_free4zuus.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/ggqgcAM/business_leadership_strategic_thinking.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_602c0968c5cd7.pdfIn PDF document text
    • http://leadtop.co/4450950713rcqkj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/61982362251.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/84842053784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/454c87cf-d3fe-453e-8e68-accec3742432/16.1_our_dynamic_climate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8aee54e-d980-40e5-af80-674b2a5b3497/57385317164.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/lepuvireb.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/gufadoxe.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_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 5540 bytes
SHA-256: 3ba753c138a0a379abd30c142f3a3ed4a9d37725c2289e6fac27deeb89bc39b4
font_01_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 10780 bytes
SHA-256: 6cb589e829473de86c4272f9c11832a0f356a5b694f53c0dd8be6028412b6e81

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