Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd73b8f7d6fcf0c…

MALICIOUS

PDF

72.9 KB Created: 2020-11-24 06:04:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d86f53ebe4e90258f60766fd0290b46e SHA-1: de3fb76cc671c21ca9f2c78a16c9ca99545419a5 SHA-256: cdd73b8f7d6fcf0ccd61859aa733e3edb6521499b6b7ec3aeeb59837e6e375b9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://trafffi.ru/aws?utm_term=cid+full+form PDF link annotation
    • https://sexuxuputipod.weebly.com/uploads/1/3/4/8/134855156/e5f422b8acd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_5fa194916617c.pdfIn PDF document text
    • https://sipekenatevare.weebly.com/uploads/1/3/4/7/134776107/5073853e62290cf.pdfIn PDF document text
    • https://zeleruzonupaza.weebly.com/uploads/1/3/4/3/134358533/tawojebu_vuxebuxisolu_feguwoxisi_wowujotitelixe.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/tojuwumuvumopa.pdfIn PDF document text
    • https://lazaxakekobopox.weebly.com/uploads/1/3/4/8/134878873/3391685.pdfIn PDF document text
    • https://kodupupagunoj.weebly.com/uploads/1/3/4/3/134314474/jazoguket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473047/normal_5fa6e081d7a0f.pdfIn PDF document text
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/wujaxurel.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/794c1588-748d-423d-ad7b-45e32ad7536c/steam_siege_setlist.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/boring_bored_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/ms_publisher_pamphlet_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/the_everything_guide_to_anger_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1405e7-051e-4d50-a594-a66788e729e2/monthly_planner_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 4572 bytes
SHA-256: 1627a3c03df8304500616dacd297d35ed123cde90d62bb4c83ec7b2841598c35
font_01_sfnt_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 1924 bytes
SHA-256: 010eaa6fe0cf0474005e1d6c68a56ae9ce47cc42a4a22c9b7b258db4bc591ef8
font_02_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 10696 bytes
SHA-256: 4263fb711876e74bdf7411c4f40583c5c29d7e65f3f1d0bf8ce90a1ae865d0e8

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