Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b5b9bcd2e7347f…

MALICIOUS

PDF

79.6 KB Created: 2021-03-28 06:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f35e7c456229aa573bf75a266b5eeaf6 SHA-1: d4cd0dfdf71abaa315dedf5227c651ad900eac54 SHA-256: 36b5b9bcd2e7347f69edfcc133388a17c18f66369b550bff7399f2b89ed37155
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristics indicate it functions as a link farm, directing users to external sites like maypoin.ru and kepojitu.22web.org, which are likely part of a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://maypoin.ru/award?keyword=concurrent+engineering+pdf PDF link annotation
    • http://kepojitu.22web.org/90136598274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_5fd618f8c3d7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484375/normal_5fce2a0ee2f46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504839/normal_602c5fb1389a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_605863bc4077f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_603e8f383effc.pdfIn PDF document text
    • http://xiziwepotifeb.22web.org/rearrange_pages_acrobat_xi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_602441a5e3473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427828/normal_5ffb7b40a2bf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_602559670616f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467926/normal_5ffe70e0bea07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_c35a1319d5bc4522a3214ead928e79a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punurum/paruzefefasa.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/xeluxabut.pdfIn PDF document text
    • http://pejefovad.epizy.com/43243237960.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/aristocracy_form_of_government_definition.pdfIn PDF document text
    • http://kidojudal.epizy.com/nokia_button_mobile_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/32302252646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d63bd7-648c-412b-9b2f-ec6da6f9a140/7091048254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a025d11-64af-42b7-8cf1-62be67b520ec/pippi_longstocking_costume_plus_size.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_625257343a134708896ef04d106c27ac.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_2ac5fd059fcf47b182ad7942a159521c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b6f3da-4a1a-4aeb-bebe-88243cb728b5/handy_stitch_sewing_machine_how_to_use.pdfIn PDF document text
    • http://botasalipigu.epizy.com/rojatiweketimuxekoju.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_49b1f18184d7472583784a5ff6c20da5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/515659d7-3d42-4593-bc63-8a9107dd2f8c/pamalulegozonaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/bivosujojisavokedogegeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/293e69de-8560-4d2b-b095-d26086cbcfee/dell_vostro_1500_specs.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_2e304453e00b4f8c8af7c2943c323a2d.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_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 4808 bytes
SHA-256: 62e7ee34ccd40859d4caf5448fd28a4b0d05bd06db12f37c9c2d67999ac7b7df
font_01_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 10928 bytes
SHA-256: f3dddd752513dbc7556cbfa619f4815ea53c2ac060de11ae7f2f6645921c4543

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