Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eeca75e4d755793…

MALICIOUS

PDF

72.1 KB Created: 2021-06-10 15:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cdf40a73ee32a6bee2f91de133ebcfb1 SHA-1: 8c3c1f1611d16648bc359c73abb12930d7dc2d0f SHA-256: 7eeca75e4d7557931e3bd7bb8cad0b0d4e1521b587eb3a02d519d9730622ab8a
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 phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The document body, though heavily obfuscated, appears to be a lure related to 'wallpaper'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/pbw?utm_term=m+akshar+wallpaper PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409621/normal_602d43b87e669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_60233e9614b3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_60bba98acae5a.pdfIn PDF document text
    • https://wapojopaboxijok.weebly.com/uploads/1/3/4/7/134747084/narisen.pdfIn PDF document text
    • https://sonodube.weebly.com/uploads/1/3/7/5/137517068/202935.pdfIn PDF document text
    • https://nuzopotox.weebly.com/uploads/1/3/4/4/134497293/lafumebokij_dofolujigomisi_geruki_tepumujulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501208/normal_6023c3dda2470.pdfIn PDF document text
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/kurubobakavi.pdfIn PDF document text
    • https://jisofuzevilane.weebly.com/uploads/1/3/0/9/130969501/610621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_600f0572f062a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5ff146f6d23e2.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/tosorefinerapu_zelosusezipil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_603b53a282f47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_5ff221f427ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_600c70d8f0b12.pdfIn PDF document text
    • https://wexaluzeneroxer.weebly.com/uploads/1/3/0/7/130776054/0428f2a.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/357706da-45f9-46a4-85d1-6f3aee14dd74/27943749504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3462d11-6cf9-4632-a78a-cf82156102cd/49058584533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3cf43e0-3314-49e8-bfe7-189a85b1db14/the_dream_of_the_rood_important_quotes.pdfIn PDF document text
    • http://jukozatixul.pbworks.com/f/vojadigol.pdfIn PDF document text
    • http://xofitesu.pbworks.com/w/file/fetch/144946710/jivasoturafadabubowatunez.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/f/tubemate_apk_for_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b61500-fece-4e52-86af-c24196c91d1a/which_sentence_is_an_example_of_faulty_coordination_in_the_battle_of_britain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d04bd2f-af91-410d-ad8f-51fcbbf77650/ales_km_paragraf_sorular_indir.pdfIn PDF document text
    • http://jeveriwilum.pbworks.com/w/file/fetch/144835932/airbnb_design_system_language.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_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 5068 bytes
SHA-256: 8b0526aa639dffd716c8a85ae6c4145ae9405716e7e5117a9d1f176ddda652f9
font_01_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 9904 bytes
SHA-256: 104eff52b618b0a978d8ad2d76bcfa9d66d6f10e265dbdbc64548ea74df3ccb6

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