Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8107e40b6aef797…

MALICIOUS

PDF

96.0 KB Created: 2021-04-01 05:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 43efe207d9cd78c97690b707608c05cf SHA-1: f077cc82b057926d7dfa087ecb5e3e75b39fec47 SHA-256: c8107e40b6aef7970598ac26b7c9bda827245c22d24cbc718327bbdd9feb4e4c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=pharmacology+of+cholinergic+drugs+pdf PDF link annotation
    • http://forpost-electrica.ru/how_to_write_freestyle_rap_lyrics0lfh8.pdfIn PDF document text
    • https://povisegidugukab.weebly.com/uploads/1/3/1/8/131871963/jeporojo-padara-legowelamapedi.pdfIn PDF document text
    • https://mewatejo.weebly.com/uploads/1/3/5/3/135322937/fovuvuxukazuzen-vapas-tatagelukaraka-fexumigudejip.pdfIn PDF document text
    • https://cdn.sqhk.co/xigofidiw/ucgdgei/egg_wars_download_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/pejibuti/sUpAOhe/bituvekeroximexikoma.pdfIn PDF document text
    • http://snt-br.ru/how_to_find_wps_pin_on_brother_printer72h7c.pdfIn PDF document text
    • https://cdn.sqhk.co/seranowe/MhbDsoG/facebook_dark_mode_android_free.pdfIn PDF document text
    • https://rodagekutav.weebly.com/uploads/1/3/5/3/135313742/ff6658.pdfIn PDF document text
    • http://autobaff.xyz/28630806823mdgsj.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/jCvhbTA/mi_telcel_paquetes_internet.pdfIn PDF document text
    • http://auth02mobility.com/katepusekosemox2fcet.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/040fb8.pdfIn PDF document text
    • http://milansit.space/jilunareridofipijk8vd.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/jajoxulabojaso/43781394076.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/revajilavetonanonoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b65e83a3-1262-4a6f-90b8-4902bea2d9c3/51766530856.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/dewojeliwewizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/174b105c-864b-4009-8cdd-ac6d32055a33/84779231992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97cd6d73-dd81-4f6d-af4e-0ca45ce4cb80/disepejilopesisudit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/872acf27-fe99-443c-a5c8-1631cb17984e/22199500181.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001564e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1564E 18060 bytes
SHA-256: f52b81e971c33abbd2a085e64c0308935ad6f1b1db524c7d9afe84508a14400c
font_00_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 5672 bytes
SHA-256: aac2bba84ef8d757fd8ae4903817bc5724d8ab6abfb5445cd7309212d8526ae0
font_01_sfnt_off00012eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEA 11560 bytes
SHA-256: a81493dadee9be3f790696da9bdc9555911ac07c93d7b595fb7f4aea14e82f7d

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