Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d28363faa7e790…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 00:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bf97132a6b568a6c9b876941ce25fdd1 SHA-1: 5ee74eb29e8d0ae9a00421fe09005c5e18eca27e SHA-256: 38d28363faa7e790ee2402c79808ae62d531a23e9ac058876a77600ac3bad757
134 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of a 'download' button lure further suggests a malicious intent to trick users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hongshengfish.com/uploadfiles/2021090111102140613.pdf In PDF document text
    • http://seghers.kr/data/editor/file/1900738003613483e5716b5.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/19858279678.pdfIn PDF document text
    • http://355353.ru/userfiles/file/28065145197.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/tagobokomegagedi.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/91183830881.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/91948525823.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/76893497015.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/gizowazutadebonafawuwibeg.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/wipexajugegu.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/mekodozi.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/sazojerojaxag.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/21215053168.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/1981177101.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/41876615764.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/katigapojimokimalazin.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/gufomez.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/bolewidib.pdfIn PDF document text
    • https://hotelcorona.ro/files/74076130244.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/3296437539.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/71826091325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fifty+shades+of+grey+english+full+movie+downloadPDF 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_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 17772 bytes
SHA-256: b9b6d3a6a83128d019a689c9d957533fd8f95ba0b128cf824c268bf794020453
font_02_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 11144 bytes
SHA-256: c878434b7742bfae660002a9ff959ec5e08b17f09ba8243a0dfa02bc45e7bc63

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