Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca88d7b0102785ec…

MALICIOUS

PDF

75.5 KB Created: 2021-06-14 23:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9505b637cf65a39c6856975e71a0a0c8 SHA-1: 54577a4d406848d1b90866099b5faeb3934fb015 SHA-256: ca88d7b0102785ecc4c88ea4b3a4589bd4bf2955b374c65f195d242add8d9aaf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, with one prominent URL being https://infrive.ru/pbw?utm_term=we+are+okay+nina+lacour+pdf. This suggests the document's primary purpose is to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

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=we+are+okay+nina+lacour+pdf PDF link annotation
    • https://xolebezitiditas.weebly.com/uploads/1/3/7/5/137513803/4d98865b817.pdfIn PDF document text
    • https://vavepinabuma.weebly.com/uploads/1/3/5/3/135303395/6023641.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/662f57997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457854/normal_60274dd9c7d9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477620/normal_60bd7c023a9e3.pdfIn PDF document text
    • https://kixusoboli.weebly.com/uploads/1/3/5/3/135394292/lilaxozutovufet.pdfIn PDF document text
    • https://lubipufubuk.weebly.com/uploads/1/3/4/5/134597980/buxiwupojen.pdfIn PDF document text
    • https://lovokavupas.weebly.com/uploads/1/3/0/7/130776776/pinifelobisimin.pdfIn PDF document text
    • https://pivuwolugere.weebly.com/uploads/1/3/4/0/134041199/zajodalav_purizosobiwuje.pdfIn PDF document text
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/4476915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_60580a2c67e79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beratirupo.pbworks.com/f/the_gameplay_of_tekken_3_free_download_pc_game.pdfIn PDF document text
    • http://damopijos.pbworks.com/f/the_school_of_greatness_free_download.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/format_of_gazetted_officer_certificate_for_aadhar_card.pdfIn PDF document text
    • http://letekejafo.pbworks.com/w/file/fetch/145231665/lunoxarem.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144833709/53897594178.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/f/telefone_da_hapvida_em_goinia.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144998280/58235215383.pdfIn PDF document text
    • http://nojewalikar.pbworks.com/f/boboiboy_full_movie_in_tamil_download.pdfIn PDF document text
    • http://wimarolos.pbworks.com/f/o_boca_do_inferno_ana_miranda.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_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 5148 bytes
SHA-256: 2a2370ad8184b9e74f5e4705d056004d327b490ef65f46b11b407e9ed3cd1df4
font_01_sfnt_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 12136 bytes
SHA-256: 5ae614b20bc811003cbb88237f268b2ac8db343f2278fbfcebd96058aa9020d3

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