Malicious PDF — malware analysis report

Static analysis result for SHA-256 b676253ed63193f4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 06:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65e9c22dc368474299f74afe054e36b2 SHA-1: 83a492220fc5371bce936bf8dc85569cc50ee0f0 SHA-256: b676253ed63193f4eec62fe15adfa7a7250131a6aad109136ffc13e1e7597e0f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to potentially malicious or unknown domains, suggesting an attempt to redirect users to harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kargo-box.com/uploads/files/36780887528.pdf In PDF document text
    • https://mattress-leader.com/media/14030089388.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/malobe.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/44767344502.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/nugenal.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/rawavopox.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/69501080015.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/paparefodefabizoz.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210916_BE3574653909190E.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/39346581778.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/64859350785.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc9d2d714e---nizezazopo.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109041001133571.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/83062664592.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/5696320130.pdfIn PDF document text
    • http://elma1.ru/!upload/files/53080613640.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/51427241554.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/deruwiti.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/butup.pdfIn PDF document text
    • http://teifsepahan.com/files/file/77008961729.pdfIn PDF document text
    • https://terracell.pt/images/file/65371976027.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/lerasaduwaserinorabap.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/nifefoxixapuxoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=movies+time+apk+latest+version+2020PDF 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_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 17608 bytes
SHA-256: d3562c8694340f725390dbea7786ab226148e47cc6dd5aa9c5db38b1662856d4
font_01_sfnt_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 10808 bytes
SHA-256: b8b31533c9d099438f8d2e9392ecc8f09b5e77d9fa5392b388fe4dd9f1220633
font_02_sfnt_off000125dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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