Malicious PDF — malware analysis report

Static analysis result for SHA-256 477e8a59be652031…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 10:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d067ab282d9fe04687a12cee2ed46ee3 SHA-1: 8d2511535509f20728998b72d35fbfb090d03138 SHA-256: 477e8a59be6520311f67bfbc876f295322d157c68ac0f813ba2a1a2e11c9621c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=roblox+apk+hack+download PDF link annotation
    • http://vidiniaibreketai.lt/userfiles/file/71633931898.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/pizifejolepejotaga.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/fewuwamizedivu.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/xupigebofitetu.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/bujuxirarijejofaxobogofiw.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/51619977755.pdfIn PDF document text
    • http://www.heksan.com.pl/file/93886998619.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/35438953040.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/31324923579.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/vaboxevijakona.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/19540265933.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/bunuwibejolaxexavisada.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/40733060604.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/80893660718.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/sajemulinojine.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/dubapipakakefadov.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/36121440091.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/fixemelugesuxugomi.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/34679294173.pdfIn PDF document text
    • http://wych123.com/upload/files/48859761765.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/bivekidewa.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/95418620420.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/wuxubanoxixesawarug.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161396f4600cf2---99149145397.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BD 10484 bytes
SHA-256: 028f370e54b8f5690aa961512d76fb3e002e70f27033354626e4580aa9933824
font_01_sfnt_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 21880 bytes
SHA-256: 24325e2ec46ef8f7578e54ce6babea0598c1e2c6585b2c3d331cf28d267cc6c7

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