Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c79a49557c83761…

MALICIOUS

PDF

72.7 KB Created: 2021-05-31 19:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8c4b38d779faedd4d4ec2b4c00a466ea SHA-1: aaec360ef42fbc1bd4d2fe958ec688474a326ea0 SHA-256: 8c79a49557c837617deb25970853de92717cc3d94a92bfcb725481f189da2ceb
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 0.9997

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://infrive.ru/pbw?utm_term=warrior+cats+movie+casting+call PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393637/normal_60534110b5b2e.pdfIn PDF document text
    • https://nefufepaxesa.weebly.com/uploads/1/3/1/4/131453268/borugel-wavuju-nagegig-lufuganinawov.pdfIn PDF document text
    • https://zisaneviz.weebly.com/uploads/1/3/4/3/134319132/guwefetofabor-kuwazu.pdfIn PDF document text
    • https://nokiziwevapof.weebly.com/uploads/1/3/4/5/134507241/6389985.pdfIn PDF document text
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/febumumolirorex_paxudukubamope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369788/normal_5ff929ce0f74c.pdfIn PDF document text
    • https://medumoxil.weebly.com/uploads/1/3/1/0/131070238/4851467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_602c0c6dc7e70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_604d6ab0c143f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470685/normal_60320693982ce.pdfIn PDF document text
    • https://ronuviwa.weebly.com/uploads/1/3/4/5/134587060/5639604.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/c4db0c61-396e-454d-b970-328f17091355/curb_your_enthusiasm_season_9_episode_1_full_episode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/598d38a7-895f-4ae9-971a-9bdd12c8d45d/42336128833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c8caff-798f-44a6-9fb3-6b5ca0ade3c0/interior_designing_course_fees_in_delhi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3fc8d92-ae77-46c6-9774-0b801cf86b8c/85537128479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060d3a6d-5e66-4f4d-805d-e838ebb91de6/88905542341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea273468-fed0-404d-b39b-453a31ce565f/vizio_remote_model_e600i-b3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f2a903-6bd4-48ef-9c98-b628aeaaead2/69240005802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d45451-ebb1-4515-8dd7-f49de743a3d8/how_to_reset_bunn_tea_brewer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6950c851-0a63-4002-9fb3-0e8395bae264/88214225389.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_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 5192 bytes
SHA-256: 5522037c1b99821ae08dcc212dd91cffbfc15aa5520b972215dcd8e2e0a56221
font_01_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 10996 bytes
SHA-256: c4da28d99305bc459071cdbdaefae420ed35228d503bbdc5d18c459c51035c76

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