Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b9c20b19302221…

MALICIOUS

PDF

98.0 KB Created: 2021-04-10 10:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fce46f163059d20743087699f4e71e45 SHA-1: bec0818cf51eb9a49115f1e48b67b6d2f4cc98f3 SHA-256: e9b9c20b193022212c41467337fd78b098aaa97ae0c29711253a27b2320d70ea
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or SEO scam. The document body, though partially garbled, contains text related to research methodology, likely used as a lure. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://jacksth.ru/strik?utm_term=por+que+es+importante+estudiar+metodologia+de+la+investigacion PDF link annotation
    • http://bukuxubujexa.22web.org/zokofijaxukuxudusag.pdfIn PDF document text
    • https://bufogepuvuzi.weebly.com/uploads/1/3/1/3/131381066/2821630.pdfIn PDF document text
    • http://usacarins.com/85692621840zo32u.pdfIn PDF document text
    • http://begetus11ppz.xyz/what_are_the_different_types_of_process_models8appb.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/iaggIgc/9176626351.pdfIn PDF document text
    • https://cdn.sqhk.co/wotudasigeb/bsIiaeg/rowdy_baby_song_audio_masstamilan.pdfIn PDF document text
    • http://thelait.pro/tususadipobatniuxs.pdfIn PDF document text
    • https://bovitala.weebly.com/uploads/1/3/4/4/134497817/penubunego.pdfIn PDF document text
    • http://gagilirefoj.22web.org/javagevebipuvatudanabu.pdfIn PDF document text
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/dirunodef-tebigaxolava-jefufupojejero-kugime.pdfIn PDF document text
    • http://dutuvowori.22web.org/tecnicas_de_primeros_auxilios.pdfIn PDF document text
    • https://gabubogoko.weebly.com/uploads/1/3/3/9/133997439/9ab6ab8d9fba.pdfIn PDF document text
    • http://ritual-venki.online/65599415429xls5f.pdfIn PDF document text
    • http://fakts.design/94823472658fm82x.pdfIn PDF document text
    • https://fatopozan.weebly.com/uploads/1/3/4/5/134581496/bijakun.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/paxunu/google_font_arvo.pdfIn PDF document text
    • http://zupifimiture.rf.gd/beginners_printable_bridge_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/koromazipexefupexatu.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/juzisisuvixew.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/terotu.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/fronting_phonological_process_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/cinema_apk_parse_error_firestick.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/dobodovojonojesubafiw.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/how_to_install_netflix_to_skyworth_tv.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_off00013c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C77 5580 bytes
SHA-256: ef3bd342e64b168b1a2f58543335b9e94d704f5efc3cbe75149c3aa0a9dfe786
font_01_sfnt_off00014f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5A 13460 bytes
SHA-256: 1f4013230e35c152d339ede84b71df177e9d1b9616431a77e5f5bd8704c25dbc

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