Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90cadb058e7a30c…

MALICIOUS

PDF

74.8 KB Created: 2021-03-16 16:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dce1480824c2d8d8fae8556898e3e5d7 SHA-1: b856f07f66458f52313dd199d453547b787615cc SHA-256: f90cadb058e7a30ce89d5dcbb8a86fa096177932e83c1c55c14917702f40fb6a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://midufefew.ru/123?utm_term=physics+one+dimensional+motion+worksheet+answers PDF link annotation
    • http://fodamibokaf.66ghz.com/37332720033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482206/normal_5feb574505f0a.pdfIn PDF document text
    • https://kexezesokofu.weebly.com/uploads/1/3/3/9/133986719/8140977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456376/normal_6025588161110.pdfIn PDF document text
    • http://makukenumeg.22web.org/android_backup_all_apps_and_data.pdfIn PDF document text
    • https://rejomopoxe.weebly.com/uploads/1/3/1/3/131383333/4137086e70ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_602acde14baf2.pdfIn PDF document text
    • http://womenit.space/cd_booklet_photoshop_template9q5fo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366976/normal_5fc9e6f83c0de.pdfIn PDF document text
    • http://winoraama.website/where_are_the_georgia_guidestones_locatedgrj7s.pdfIn PDF document text
    • http://justiciaforjustice.com/vodifejinitebofusajoxakwspg.pdfIn PDF document text
    • https://doxuxipineza.weebly.com/uploads/1/3/0/7/130740192/magenuk.pdfIn PDF document text
    • https://xazupegenam.weebly.com/uploads/1/3/2/6/132695472/3357260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d41f9afe-8d9f-4057-8252-a71f9a365523/mugufekomidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a4d1f4-89d2-4186-8335-cdbfdde082d9/gujumexogogelezuzeton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6130f727-57fb-4144-bee8-d5d62c90b017/vabobetonoletixamegapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e78bb99-4320-4ac7-af5c-b12ad3eac468/pofilevube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08a8cff7-6050-4b70-ad98-356e12b55c9d/xabuvamolav.pdfIn PDF document text
    • http://xugonowelimije.epizy.com/31579931168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2520f6-90ad-49ae-9694-44ee9f3d4148/hp_officejet_4500_printer_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e04b0c8-3f54-41d3-a06d-e34e4883ea08/fobikorisojamet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4e4c8d-480f-4d86-8b15-04a186ca2db2/wufurutipabakigafonobopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f13deb-413f-4341-bff1-cea10e376fe2/in_another_country_summary_in_nepali.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 5436 bytes
SHA-256: 5ebab1d8b7cda95ff6569e0c387e67116a573e1aeb8a117a770b1edf40d34370
font_01_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 10708 bytes
SHA-256: 915cd2e30bd0eb37e83d61fb225724d98cccfa52df5d40a77602b4ccf95b14b4