Malicious PDF — malware analysis report

Static analysis result for SHA-256 3feb54fddb1f464e…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 17:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9a6cfb44708a81f142f258315ee7506f SHA-1: 2417a03feceda3625884602fd046b4dfaea2f151 SHA-256: 3feb54fddb1f464e47b8e5094c5c8490ecde1f75788d7f114ef8cc19c168fa63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, reinforcing the phishing lure interpretation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fishingas.com/userfiles/file/81625533169.pdf In PDF document text
    • http://jandenzobv.com/image_uploads/file/29146223830.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/15638720953.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/96706144671.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/81810376430.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/javuguwidosufan.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/donegirivukized.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3eae9d5dc693464abada1471db99f440/67164646955.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/satofujopanarugiwuzu.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109091912081981.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dofavanutekowazuzit.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/lefejogoxero.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1ba94645c2cc4ea7a04e4c97955dcf25/parogofarubam.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/duwesud.pdfIn PDF document text
    • https://j26clean.com/upload/files/xejidazenavixumofix.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/92442462054.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/judumuxaratiwopo.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/2511173938.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/jasufipe.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/bukotofotowol.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/17317539463.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/lamowinasujoledibexuxakit.pdfIn PDF document text
    • http://portableandcool.com/files/files/89141676353.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/24393697513.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wivomegorakimazas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=my+hero+academia+season+5+namePDF 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_off0000b521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 10732 bytes
SHA-256: d912d0a55ac20e88d5d3665e00a75533d2ef132ecbd5f281c81999a19c6cae3f
font_02_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 16580 bytes
SHA-256: 741d242ed8c6335a92436084c394999f2902227cd765b04602576264e083f78f