Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff3a136866255a2…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 14:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 34316550a3c52f06eba1a5b32d254388 SHA-1: e48e2e55f8610f8f10079912ec056b2dede5ae5c SHA-256: 2ff3a136866255a2711c06a577f2a760e36d414d08b7468ff557fb598a95732e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm, suggesting it directs users to potentially harmful websites. The PDF structure and embedded content indicate it's likely part of a phishing or malware distribution campaign, possibly using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=frankenstein+full+text+pdf PDF link annotation
    • https://daaeportrett.no/upload/file/bobosodozo.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/sazemosavokibemime.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/zijuka.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/xaraginukivenaraguf.pdfIn PDF document text
    • http://darec.sk/files/files/85404540049.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905102543946.pdfIn PDF document text
    • http://zerosquareonline.com/file/83986257956.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/86039602552.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/vivijevozibomobe.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/44487795796.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219131212224871.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/fizuxilubenunuwe.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/tumedop.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vedulitipiganer.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/7392010126.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/remanetodori.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/14905197865.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/97376833993.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/46210328214.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/53286866743.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/rerut.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/80554466780.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/xusurekizegojamovivus.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/79916273179.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/64218212405.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_off0000afc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC4 14932 bytes
SHA-256: 1b9d740309a9acafe890d762f77cf50718912cdb8650d95d6919b5a58617e097
font_01_sfnt_off0000d56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56D 10640 bytes
SHA-256: 48a2a1d750673887815a1de814ac55031aea6cc21f35d0660e8e90a71a5d10a3
font_02_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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