Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e004cda4279fc8f…

MALICIOUS

PDF

77.7 KB Created: 2021-03-11 22:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: efc021f1e63454470ee27f80e658f538 SHA-1: 05dd0df17c451006a8ba973b211a46193fb42706 SHA-256: 4e004cda4279fc8f40ea688f6ae3d3942eac556edf26cb13ac4dd53b325cbb4c
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external websites. One URL, 'https://yafferge.ru/aws?utm_term=que+significa+un+titulo+de+carro+salvaje', is identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates the document is designed as a link farm, likely to distribute malicious content or engage in SEO manipulation. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=que+significa+un+titulo+de+carro+salvaje In PDF document text
    • http://pepipejevu.iblogger.org/1415712718.pdfIn PDF document text
    • http://nalivosebek.22web.org/daily_life_in_ancient_egypt.pdfIn PDF document text
    • http://kitazixozakabu.sportsontheweb.net/soil_mechanics_and_foundations_budhu_espaol.pdfIn PDF document text
    • http://lemixop.iblogger.org/mibogesoluwegi.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/how_to_write_a_good_interview_essay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_60232b6dc8962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388052/normal_5ff75e2dec977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462350/normal_6027f7fbcaa30.pdfIn PDF document text
    • http://zenajok.medianewsonline.com/3961460373.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448357/normal_5fe07459a213e.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/17746437859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373264/normal_5fc6d76204abe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_02c4fdf8d5d94b718d48c71531d111fa.pdf?index=trueIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_d45a55705abe42dab1e7f9388d097438.pdf?index=trueIn PDF document text
    • http://pizuzol.onlinewebshop.net/how_to_reset_bosch_500_washer.pdfIn PDF document text
    • http://nupikokaguzixag.rf.gd/fulltone_ocd_review.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_4e9db87ff2fd472ea03a33c803495939.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_62f85a50c78f425b95fe569fafb1cba1.pdf?index=trueIn PDF document text
    • http://segudufarus.epizy.com/oporadhi_bengali_song_mr_jatt.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_01501c4e220e460bb03fd8199d5b670f.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_8862617871e5412aa696908cf80e4eb6.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_f043c78f9ae447a19d8cbb1af514f608.pdf?index=trueIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_a871646669304b12a4cce36c1d8c427e.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_5c72b17ec7ed4016a1838969c55eee39.pdf?index=trueIn 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_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 5388 bytes
SHA-256: 594a74a10bb525f4955a34e5676b954c1734cb12f19ebedbd3682e817f54df59
font_01_sfnt_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 12228 bytes
SHA-256: 109552edd918a49750edd5fd595590b102e3fbf4e9063170271097ec271b8c01

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