Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31e7b59823fb6be…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 18:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e31742cc59740382470f3b9c3dd9e87 SHA-1: c2f96598abf5f2fcd31f6e05d27e0cf1e7d690bd SHA-256: a31e7b59823fb6be814c35e13359978ec9679cfe1fb2afb4ed25260a58d1bc0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to distinct hosts, suggesting a link farm or phishing campaign. While no scripts were directly extracted, the PDF structure and embedded links indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://digitalpolicycouncil.org/imagenes/file/porutebuvafiwutunijunaja.pdf In PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/86673363088.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/gugarafiwujoj.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/27518632635.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/45019082664.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/wibezi.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/gifazuxapowalasus.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/4401776641.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/90641421503.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/12380344723.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/zipazelanono.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/38360698686.pdfIn PDF document text
    • http://watch62.ru/files/files/ditepabidirolavoliladila.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/vemuxixegi.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/fajebekupebulaxifozati.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141140c57bf0---bufefibikokomoxif.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/jazufirudakap.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/mamen.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/70725793105.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/96007480554.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c37e782d1e19d4279b84173819b2446a/baxibisulu.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/tedelufiwojinofanusevus.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/25859956441.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/sivufalimegi.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/40733060604.pdfIn PDF document text
    • http://sieuthibds.net/images/files/87656641084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=words+that+start+with+n+and+end+with+nPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 16832 bytes
SHA-256: 3cf7d5e51861ec162dce165b259391f1e62ac9a4c636b47bd34145cd03829694
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 10380 bytes
SHA-256: 10bb2469aea51c99353ef6929721343332d0c5cabde55d5ea93de8ad858516e1