Malicious PDF — malware analysis report

Static analysis result for SHA-256 b542f5b128dcee40…

MALICIOUS

PDF

58.4 KB Created: 2021-02-08 05:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 35775ae0d1d3dbfd3291486845963b1f SHA-1: a961e999c363fbf379204b7e61187c3f45faad11 SHA-256: b542f5b128dcee4033e514d8b625e1245b535af0c4b66ce628a8597f2f15bf0d
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically designed to lead users to malicious infrastructure. The embedded link `https://crophysi.ru/aws?utm_term=video+twitter+apple` is flagged as a known malicious redirector. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6421

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/aws?utm_term=video+twitter+apple In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5fd940b95a001.pdfIn PDF document text
    • http://zapazereti.22web.org/stamp_font_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390068/normal_5fc6947f0fb68.pdfIn PDF document text
    • http://vifuwala.iblogger.org/41005833494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_601dfcde6917b.pdfIn PDF document text
    • http://bilapak.66ghz.com/vuvuvewez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444869/normal_5ff12eb1e0400.pdfIn PDF document text
    • http://voferumupisefag.rf.gd/exponential_growth_and_decay_worksheet_and_answers.pdfIn PDF document text
    • http://kazaxese.epizy.com/nazovozotomukoxoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/94245094904.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/meaning_information_asymmetry.pdfIn PDF document text
    • http://memokikadu.rf.gd/oppo_f11_specs_pinoy_techno_guide.pdfIn PDF document text
    • http://wulitebajanuba.rf.gd/karoxatuxumagasenozaku.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/28058894671.pdfIn PDF document text
    • http://vejebuta.rf.gd/gta_v_redux_mod_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/gimanutolifuxukanamu.pdfIn PDF document text
    • http://buvinisupolo.rf.gd/40281107582.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/custody_agreement_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/nopuk.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/78740243818.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/aegisub_windows_10.pdfIn PDF document text

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