Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68f718595233b09…

MALICIOUS

PDF

77.6 KB Created: 2021-03-24 10:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1ee041776ee3cbca6e90c64dcf4fd6cf SHA-1: b27e02ba13d1b00f7e5bfb25dd2d5c28b2c0e08a SHA-256: f68f718595233b0951d207c74f306ee89eed4be05d8246113dfa9b5e3f0618b6
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified as a phishing attempt by ML and ClamAV heuristics. The document body, though heavily obfuscated, appears to be related to academic search terms, suggesting a lure to a malicious site. The presence of an external URI and the ML/ClamAV detections strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=receptores+nicotinicos+de+acetilcolina+pdf PDF link annotation
    • https://lurofigugibax.weebly.com/uploads/1/3/4/6/134686006/262584.pdfIn PDF document text
    • http://ruboperuba.iblogger.org/nazikiwofuji.pdfIn PDF document text
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/xesefiweviju.pdfIn PDF document text
    • http://nuvoked.22web.org/game_bounty_rush_mod_apk.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/midizaxopazeji/interlinear_bible_greek_hebrew_english.pdfIn PDF document text
    • http://xujogefup.rf.gd/nuderagiruse.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_9f5c457091394f29b6b3da7c78b63298.pdf?index=trueIn PDF document text
    • http://miripiwamaza.epizy.com/punctuation_worksheets_for_grade_2.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_56cc7a6f3d594ac5a94bb6e31c4f3410.pdf?index=trueIn PDF document text
    • http://juruzimezez.rf.gd/wumiputotiwobufetise.pdfIn PDF document text
    • http://nelarigutixus.rf.gd/sample_letter_of_agreement_between_two_parties.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_772c05329e26419d950bb3ae6899c97d.pdf?index=trueIn PDF document text
    • http://fabebosuvolilu.epizy.com/xilufabukokanulakinavana.pdfIn PDF document text
    • http://toterow.rf.gd/super_sailor_chibi_moon_transformation.pdfIn PDF document text
    • http://jinujatafariva.rf.gd/49358547636.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/zapinuzilijibup.pdfIn PDF document text
    • http://lapesuzimu.epizy.com/diono_radian_r100_booster.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/sample_biodata_in_word_format_for_marriage.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_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 5156 bytes
SHA-256: 4665b75878318167cf875407c17961f536e46201ad0e51dcb6b14cdb7517aa5b
font_01_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 12840 bytes
SHA-256: 2c5ff3b5936a7e17736fa375e686104abdef0c8dcf76682aed22e4d587acb2e6

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