Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1eddd97b27133d4…

MALICIOUS

PDF

69.3 KB Created: 2021-10-02 00:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ae0192d4b7dbab0b5e066d0a95b439b0 SHA-1: 727507436f0a8387dcd797777fd60399a7ef2ed7 SHA-256: f1eddd97b27133d42cd15bff0137f0e6707bb45c6bc01263b8fe596a06693e4a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or visiting phishing sites. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=word+for+macbook+pro+free+download PDF link annotation
    • http://abwnickersonplaza.com/uploads/files/27360900426.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/kujusifur.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/gelewenekukajerogo.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/70274245254.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/23156079550.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/jejojamojevefaw.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/xoturoxi.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/saxigew.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/49997071464.pdfIn PDF document text
    • http://axwelindia.com/uploads/23477348214.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/35632585648.pdfIn PDF document text
    • https://halkum.rs/files/fomodixesumojefalu.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/52961676775.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/19135829390.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/18439051619.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/bupigas.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/040234238006.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/mupazekepalitegebasezi.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/16175974976.pdfIn PDF document text
    • https://bak.vn/upload/files/rexipi.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/12502127644.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/dakozalaralivisujonopul.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/tetazadofa.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/vosusifum.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94d38718d---tojubezezalideladifafeko.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/ligoreruregofifo.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_off0000b0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 10732 bytes
SHA-256: 7ad3ffeb44b482e123a53b19e2abdb1e60381fc5c1bb91b5d9e658809bf1468b
font_02_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 15040 bytes
SHA-256: 2a74fb4037da5e79e11785ae41e314f257aa745936d19b74ae8b53d186baac56