Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7fc3dab2418c4d…

MALICIOUS

PDF

50.6 KB Created: 2021-02-04 04:34:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 035a6bdb9fd59d17db5fa0d62f9aed39 SHA-1: 7684baaa30d8b0e41009bbb514a4e9e8fdfdc3a8 SHA-256: df7fc3dab2418c4da8bb2c28e24011d7b539f3d3fa715875103c9ea7d58c2987
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, suggests a lure related to an 'appointment letter' to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9303

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.
  • 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://crophysi.ru/aws?utm_term=format+of+appointment+letter+of+secretarial+auditor In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5fdafd8e575a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_5fd318f320905.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465704/normal_6006ef6bb786c.pdfIn PDF document text
    • http://boomerangoo.site/tie_dye_hoodie_and_sweatpants_setvqltw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5ff2cbdddbd54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_5fd83cf5ed78f.pdfIn PDF document text
    • http://pixxel.life/65442731176zapbq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373243/normal_5fde2d645db2e.pdfIn PDF document text
    • http://velixone.66ghz.com/autonomous_things.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369648/normal_5fc6736b8f690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_6016dfaa873e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_600f061730ad0.pdfIn PDF document text
    • http://zamividiwido.22web.org/cat_dog_dataset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_5fd855b2aea08.pdfIn PDF document text
    • http://biraxubidu.22web.org/tuxatopepofanavono.pdfIn PDF document text
    • http://bofametif.rf.gd/kidaz.pdfIn PDF document text
    • http://xurolawewetaw.epizy.com/plural_nouns_and_possessive_nouns_worksheets.pdfIn PDF document text

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