Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcdb0efb1aca1ec…

MALICIOUS

PDF

80.9 KB Created: 2021-03-03 18:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1ba15c961650fb848f645b25a0dccf3e SHA-1: 98a40b751fd26269bc2dcc245cec8592837c3ab7 SHA-256: 2bcdb0efb1aca1ec18337b183b3c1cac90083de8195ae8af877e3c86f41c601a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains and Weebly hosting, characteristic of a link farm or SEO spam campaign. The document body, though partially corrupted, suggests a lure related to educational content to disguise the malicious intent of directing users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=adding+and+subtracting+fractions+problems+and+answers PDF link annotation
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/nuzajo.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/eGSDghR/lesesemukufarisu.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/6jjghjb/best_slayer_master_osrs_for_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/CI6Xnig/super_mechs_hack_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/hizgf2x/ginetobusuvolozif.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/gRQgd9w/15471314303.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/q7ihjjI/foxaxizabepofajo.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/UegcggG/best_remixes_2020.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/sinet.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/ghhhe0a/crash_test_dummy_meme.pdfIn PDF document text
    • http://powowivoboregow.iblogger.org/walofebezawakinonife.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/O7giqhf/san_andreas_crime_city_3d_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tasaxasup/jehcjyf/benininetuzetamekamerate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vavilonogamet.epizy.com/72758789433.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/google_spreadsheet_string_concat_operator.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/what_are_the_official_rules_of_pool.pdfIn PDF document text
    • http://ketanuviz.epizy.com/33783157400.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/wojadogemuxiwuge.pdfIn PDF document text
    • http://lorevekurulij.rf.gd/31582699508.pdfIn PDF document text
    • http://zapulozamatuwe.epizy.com/weider_pro_4950_assembly_video.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 5576 bytes
SHA-256: 1e4e901cc9f9d6ed6c36cb115d57c56d6172eb090a0891f124cc001b0c9bba5a
font_01_sfnt_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 10204 bytes
SHA-256: f0edb8208bc421dedcd3f6306b03f5b7174415e2fcfeb8afa5dc1b73cfdd21c4
font_02_sfnt_off000127ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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