Malicious PDF — malware analysis report

Static analysis result for SHA-256 de311fb5575203de…

MALICIOUS

PDF

41.6 KB Created: 2021-03-20 16:16:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5f82c2aca60a35687f7286caa905e46e SHA-1: b6285428e86569bf01c4d97970fd10a4b9e8e4cb SHA-256: de311fb5575203dee5100b4e439ab12f098f20091ca36b1b9842f59ff131b397
202 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.6428

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 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-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 41 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=fantastic+beasts+and+where+to+find+them+2+plot+summary In PDF document text
    • http://malanefire.sportsontheweb.net/arnold_ehrets_mucusless_diet.pdfIn PDF document text
    • http://tokudujadi.medianewsonline.com/tennis_elbow_exercises_arthritis_uk.pdfIn PDF document text
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/7646200.pdfIn PDF document text
    • http://numojas.epizy.com/blessing_and_honor_victory_worship_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88268077-17f6-4e5a-ab0d-b01bd9d2a68c/mamiya_rz_lens_on_rb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4cbadd-fd98-44ea-9a9d-a11fa779bf20/mosizononodoxuxolobix.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_40555b595bc2460cbbc22f2acdbf8e7a.pdf?index=trueIn PDF document text
    • http://susesibukof.epizy.com/american_short_stories_since_1945.pdfIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_33e61a8aea464af3a20001f18c5281da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/california_dmv_forms_dl_44.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/applications_of_genetic_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/how_to_charge_a_flip_video_camera_mino_hd.pdfIn PDF document text
    • http://suzuzozadigij.epizy.com/nemidepepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f16d1e-8078-4729-879a-81804c1decc5/nuripisigazanewet.pdfIn PDF document text
    • http://medazupu.onlinewebshop.net/writing_for_dummies_books.pdfIn PDF document text

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