Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a45eabdf0353aa0…

MALICIOUS

PDF

117.3 KB Created: 2021-03-12 11:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: deda19095848e95b74e3536c2f486b97 SHA-1: 9fc2addd0489fbef50ac9b5b5a3e6deb9850f4f5 SHA-256: 9a45eabdf0353aa0f8323e0eb31e86c2271d70ea184052ac67b76a41a19a877e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://fokemale.ru/award?keyword=proyecto+de+tesis+pdf+administracion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5fd38feb8af3b.pdfIn PDF document text
    • http://majexifavel.scienceontheweb.net/8902514062.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/5907797.pdfIn PDF document text
    • http://pelinebaj.mypressonline.com/94552602018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370785/normal_6001cd0950fcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444850/normal_5ffb716a1a0ee.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/35106752530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_603db41be10ae.pdfIn PDF document text
    • https://nefopenexa.weebly.com/uploads/1/3/0/7/130739549/vujigodexepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_602c1d12c68ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469116/normal_5fff49cc2e9bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_604aaa8e7134a.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/difference_between_ac_and_dc_current.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_600c6c9629e11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bifamomove/rational_exponents_worksheet_with_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/schizogenous_aerenchyma_formation.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_d36b8bf2ba1b4f56a9d47a01aaa08cf3.pdf?index=trueIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_2a36aa66587248ff8f5e6471c80b3b8a.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_51190ea75371442b8cf3b5332df0da70.pdf?index=trueIn PDF document text
    • http://zutugidod.onlinewebshop.net/project_x_lz_95_reviews.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_969ce206d53e4923b6ae134739aea348.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jebokizez/secure_folder_windows_10.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_off0001905b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1905B 5372 bytes
SHA-256: 255634089f62628bfeca3d97e97933749fe8bb7c616cdc953d82f81c9185fcb9
font_01_sfnt_off0001a294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A294 11548 bytes
SHA-256: ac79719be85f1a63d5d93c5d057089e1db7dd0aeca658ff6d99e62f25dcd58fb

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