Malicious PDF — malware analysis report

Static analysis result for SHA-256 395d4a2df85b3e60…

MALICIOUS

PDF

66.5 KB Created: 2021-09-15 14:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea6ff983ae88f6a9beed482cf4122f2e SHA-1: 7ac604593bd0c5661d3d14bcdfc67c611325d377 SHA-256: 395d4a2df85b3e6096c27570381ba9ee9577039be9afc6fe83cf0d6c54f6ec6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to suspicious or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the presence of external URIs and the PDF_RANDOM_URL_LINK heuristic suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7095

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://nomylo.ru/uplcv?utm_term=how+to+run+android+apps+on+macbook+air PDF link annotation
    • http://frutapacargentina.com/ckfinder/userfiles/files/fazadelo.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/80976248925.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/fukudulelemiziravevoxeka.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/dodexijalatoledofewaxadi.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/kabipomuvibedolanimeto.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/fagenod.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/95338327034.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/dbd1ae8642ee6e6ce15466cd190eeab0/lojofavogulamerovejobaxid.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/fulavokizijonomenekufufu.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/xixezenuvuwir.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/92341137966.pdfIn PDF document text
    • http://charontrade.hu/data/file/70000031178.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/204420056.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/bavunafuv.pdfIn PDF document text
    • http://1careglobal.com/upload/files/9511344942.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/82964932666.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/89680399697.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/86511382836.pdfIn PDF document text
    • https://svltv.in/userfiles/files/sifiroreg.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/fiferuzunis.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/ruzejosodorawifenotoxi.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/kiranizaranofa.pdfIn PDF document text
    • http://huntland.hu/upload/file/sorevag.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/beviseniwiwa.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///91198751557.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 18208 bytes
SHA-256: 8ed58db854bd221ae97b3be7215dde6d79ade05e9d96a2a81be682ea64ce4fda

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