Malicious PDF — malware analysis report

Static analysis result for SHA-256 affbb51a533de115…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 19:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d97ddbeece2eb84ea8f86c6b96a2432 SHA-1: 9087907534d4cad09195e7713d814a885161de00 SHA-256: affbb51a533de115468530a1e106ec89ac9a4a3773c25e7f4416cbd6179bace0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=pojav+launcher+download+for+android
    • https://newdesert.pl/userfiles/file/lozeloset.pdf
    • http://hoteldanang.com/uploads/images/files/wiwujanuxazije.pdf
    • https://dcimx.com/files/tamubunixipenoguf.pdf
    • http://www.louisianarebarcontractor.com/editorimg/file/66459566428.pdf
    • https://interno-kazan.ru/upload/files/bibiparijasebifizevigonam.pdf
    • https://iveducentar.com/uploads/assets/file/60634684313.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b93f48841---8208279082.pdf
    • http://ilink.pl/userfiles/file/61833203193.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/bulapurexonig.pdf
    • http://hasicimosnov.cz/foto/Image/file/75550819358.pdf
    • http://ty-universe.com/image/files/20210910_201145.pdf
    • http://mrhobbscoffee.com/images/uploads/file/57141418663.pdf
    • http://laarakkers.com/ckfinder/userfiles/files/42373460868.pdf
    • http://pdww.ru/ckfinder/userfiles/files/pupudopozopivisozasebiwon.pdf
    • https://deycaterers.com/ckfinder/userfiles/files/64407837148.pdf
    • https://eguiders.com/uploads/noviluwewizuxeziranuwur.pdf
    • http://01host.ru/userfiles/files/tanumifosukukutulezuziwo.pdf
    • https://eventpro-kontraktorpameran.com/uploaded/files/57674277054.pdf
    • http://cpk.by/ckfinder/userfiles/files/vilikalenudamo.pdf
    • https://www.ewdel.cz/ckfinder/userfiles/files/kademafupufisete.pdf
    • http://dwornawodzie.pl/userfiles/file/valasesomaxewumufozumetix.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448f2bc05d3---24994158040.pdf
    • http://pozitron-s.ru/userfiles/file/betepofewegeretabu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db77.bin
b00fe6b8db6bf184c6f1a24cf910e6bf8789e68812b64cafcd8bbcb9ff47c8a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 18068 bytes
font_01_sfnt_off00010a3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 16792 bytes
font_02_sfnt_off00012252.bin
92536c41fca75bbaaa0476912820c01e33638dd9488abaceb3dc76db1c7dc251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 10692 bytes

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