Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab57aa60d092c393…

MALICIOUS

PDF

74.8 KB Created: 2021-09-09 03:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 179bd9c05379cbba66df9110dbedeea9 SHA-1: b6bcdd6a80da4304353780c12e78d2b7450cd688 SHA-256: ab57aa60d092c3936bb50f269c91072bda2763af7f1c528ad4b2b8dd067b7494
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to direct users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://immobilier-valence-agen.com/userfiles/file/17660472217.pdf In PDF document text
    • https://dondepodemosir.com/userfiles/file/22931324961.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/tufegosi.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/sanogabovopevejupiburote.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/viliniwujusud.pdfIn PDF document text
    • http://royalgroup.at/tmp/wixefufejoletejupumar.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/38854047810.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/dejopifubewo.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/84565025348.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/kawafibonuwojerovema.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/zimaboramodi.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/xetugipimalav.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/23289572987.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/jigusoniz.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/56101443075.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/40518601447.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/lodaremokakuto.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/gedepolex.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/14847990515.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/90887513393.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/vobomunomu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b53a8bb5---tudugadox.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/38877504672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=indian+train+simulator+2018+mod+apkPDF link annotation
    • 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_off0000c0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BB 11068 bytes
SHA-256: 8fd6059aed84f5be467512eb854341ed119c924e6f540e9bbf06ccbb28782e58
font_01_sfnt_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 16728 bytes
SHA-256: 0316f4bb2ce068a6415b00f9f07675b248443826dab621223d84d58acf2fe8a5
font_02_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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