Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4528b8dd93c9a3…

MALICIOUS

PDF

75.6 KB Created: 2021-03-03 14:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3fb56284e1e9524d3e13f956b2049838 SHA-1: e9e1ce09bd08ebf25c46373e45a9d48784185aaf SHA-256: 7a4528b8dd93c9a3e078192a2e1b385cff48325a6e94bf4e3d2846e251fc923a
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, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into visiting the malicious site.

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://pelibifir.ru/wix?keyword=electron+configurations+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428035/normal_5fd13b033e7a4.pdfIn PDF document text
    • http://tizakeguwowil.22web.org/dictionary_app_apkmonk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_603bc27f1edba.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/jirefolobarefa.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/zikelitabesato.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/vodobevaxupijiridakod.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/24349880478.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/10146660025.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/8295413863.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/33949743885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zimopup.myartsonline.com/nujin.pdfIn PDF document text
    • http://ratotepuno.rf.gd/factorization_questions_and_answers_class_8.pdfIn PDF document text
    • http://xibadon.rf.gd/zujowuwaxudigabojari.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/lbbb_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/4072552214.pdfIn PDF document text
    • http://jibaberumakome.rf.gd/everstart_3a_smart_charger_fault_codes.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/bozivoxebetixa.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/ek_baar_aaja_dj_song.pdfIn PDF document text
    • http://jexawatenafule.rf.gd/32973770466.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_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 5356 bytes
SHA-256: ed796b00d583649bd0ca50a3e0c5b7173de7faf9b974cbdd881092dd54a1b330
font_01_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 10896 bytes
SHA-256: aeb634086262c03ddb7062f13d40018b6e7359104930d3b0b0d81f0e88fdf87d

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