Malicious PDF — malware analysis report

Static analysis result for SHA-256 846becffa28634e6…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 07:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa1434c5d510a1a00ca72d6a9bf87052 SHA-1: 33da67ceb5b2d8af585ed54663c9f67e9f60e734 SHA-256: 846becffa28634e604f235401dcc2a23fe11a62507f830e43102b1e9a66c45ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=life+is+strange+apk+full+unlocked PDF link annotation
    • http://romangruszecki.com/uploaded/file/48942285579.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/32894923287.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/tejov.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/55765952698.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/51711982702.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0879931001630998922.pdfIn PDF document text
    • https://ksuskalology.com/images/file/12020560221.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/zobimu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c66fa8a112---rafowaxegabixidulo.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37161663607.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/19294155309.pdfIn PDF document text
    • http://fruitsad.pl/images/file/dasuxezufojoligowe.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210903_075920.pdfIn PDF document text
    • http://szpk.hu/_user/file/40365106140.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6522a5c5---21008341473.pdfIn PDF document text
    • http://farmina.ru/uploads/files/tagisaxuzobidasozog.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/tupufotokixinu.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/40406395424.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/88374092691.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/rejijotovukukij.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/17855961152.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/viburokijozubil.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/rokapogizajekin.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_off0000bdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 10944 bytes
SHA-256: c1adc7db9f83d6273b20a2a0645177cd15c3a62ff6591be766c887366617500d
font_02_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 16092 bytes
SHA-256: 2459bb7b376e5dea36eaea969c04e7b53998739a29767c1fece6152a96d16ba5

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