Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fffc65fdf19d3f…

MALICIOUS

PDF

50.6 KB Created: 2021-01-25 20:38:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 18c2ba5cfeacbb0415be39569cd7e0b4 SHA-1: ddb3a3a25c13aa3a73db14d2423aa8e3e1907b03 SHA-256: 19fffc65fdf19d3f54f684d007ff883bc2c75ba942a81d5cab1e99437f7f3ebb
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9303

Heuristics 4

  • 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.
  • 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.
  • 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.
  • 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://yafferge.ru/aws?utm_term=exponential+equations+worksheet In PDF document text
    • https://cdn.sqhk.co/ropimipaf/EIhajau/retrospective_da_approval_nsw.pdfIn PDF document text
    • http://kpovli.ru/wijemowefuxaxuvuzuzuromuxh0xij.pdfIn PDF document text
    • http://medgaj.com/chief_followers_pro_apk_1._0._24byi8.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/difhapH/53734649766.pdfIn PDF document text
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/4eb66.pdfIn PDF document text
    • http://hydra.moscow/faligadogopilnpkny.pdfIn PDF document text
    • https://nitegira.weebly.com/uploads/1/3/1/0/131071289/garomijepolowusa.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/ge8hibX/my_turn_lil_baby_iphone_wallpaper.pdfIn PDF document text
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/95a4b47786.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/gfie5je/jason_money_lobbyist.pdfIn PDF document text
    • http://netewe9.xyz/boris_and_the_dark_survival_apk_androidanw95.pdfIn PDF document text
    • http://ita-bio.space/kapuzumujirezoredurzgcw3.pdfIn PDF document text
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/8005321.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/4629678.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/rabofudubikerogidatisoji.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/android_tv_remote_control_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/nenuxejawabajeteru.pdfIn PDF document text

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