Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c0659b64a03ed6…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 07:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fe22c2baf822632eaa7ca2b87c29a52a SHA-1: e5f3fec36e85b58341c1fe1e27579bfd43432d5a SHA-256: a4c0659b64a03ed69c4d70466a53fc292721c3847e8cde572838158147ce2dab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a structure designed for distributing links from disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hizlipin.com/calisma2/files/uploads/51568625506.pdf In PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/bilogomosisodosaxunetodow.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/figagukezafivuvetixi.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/rifavurupobi.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/wamuvozojufamumom.pdfIn PDF document text
    • https://fultoys.com/userfiles/96714883834.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/64548609886.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/nutul.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/35759299951.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/77349479289.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/betawivipijev.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/53161238086.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///wuxovuwajonakenome.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/92635912369.pdfIn PDF document text
    • http://pk.mo/userfiles/file/xigofosi.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/toponew.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/gutumomuj.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/96394220612.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/rajalutomagew.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/69485435926.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/90450452231.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/xadowe.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/tilukoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+3+android+apk+obb+download+highly+compressedPDF 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_off0000b068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB068 11604 bytes
SHA-256: aad8498a83060b5ce3f9da656a524a0cbec86b78a9cd80bff4e31030e2795cdd
font_01_sfnt_off0000cb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB73 15900 bytes
SHA-256: 59f8b2474cbbe551ef4f085fb896c9ab32244b425be00789e3701a56cbdabe80
font_02_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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