Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76597ccf20ac3d6…

MALICIOUS

PDF

84.2 KB Created: 2020-11-28 01:33:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0dd6e24aa93fb1a498be5565143d5619 SHA-1: d3301864ed0574d73d1f5f7e931ce41ce0a0fbf0 SHA-256: a76597ccf20ac3d6b9268d1be5fff9b0681b659a54cdf0718711ef9e1f2c25d8
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://trafffe.ru/strik?utm_term=www.homeschoolmath.net%252Fworksheets+square+roots PDF link annotation
    • https://pupiwikupexi.weebly.com/uploads/1/3/4/3/134348736/5982345.pdfIn PDF document text
    • https://bajusokizuz.weebly.com/uploads/1/3/4/4/134400974/puxabibefefofus.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/desizomaseliloz.pdfIn PDF document text
    • https://subefivu.weebly.com/uploads/1/3/4/6/134688636/2565196.pdfIn PDF document text
    • https://radelemetiwiwi.weebly.com/uploads/1/3/4/5/134520029/6229da1.pdfIn PDF document text
    • https://womurozini.weebly.com/uploads/1/3/4/5/134507066/f2f530af.pdfIn PDF document text
    • https://maxifabosogup.weebly.com/uploads/1/3/4/5/134526580/db75cbe3fd.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/bdf5d445-e0d4-44b0-ba76-a356a03a1352/52075079246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d59546-e326-4ca4-954d-335e4d7616aa/49055083792.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/zemigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5348091-9085-4240-a366-478d9431b95b/nike_brand_standards.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/acta_constitutiva_sociedad_anonima_para_llenar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd8ec606-fca0-45a8-8c9d-91246de34327/60204281549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99888913-333e-4230-9129-680aee32a174/gamo_whisper_fusion_mach_1_22_cal.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 5404 bytes
SHA-256: 1362e78a12b999f3b194e96e1f84095e15d0196279d4a9a283898ec7a8154c37
font_01_sfnt_off00010f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 11128 bytes
SHA-256: eb02e47eba0a52afa1de176e20308be285c1ccd98bb1efacac46a4893c75b2d6

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