Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c52a92ec8cf2c5d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 07:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 728e747e6066dc727f138837c524f114 SHA-1: beb9b701df835a70d68efed9f95b0c5cd430cb7a SHA-256: 1c52a92ec8cf2c5d76914b827c0bd6134e8cfad6a59d06bd8ffd5060d2559b2f
226 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a lure for recovery secrets or private keys, a common phishing tactic. It also includes numerous links to external PDF files, suggesting a link farm designed to host malicious content. ClamAV detected the file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zamaro.info/images/fcke_files/file/biwibodisuxolopovet.pdf
    • https://aarushimukhwas.idealviews.com/userfiles/files/vafemugozaxapilopegof.pdf
    • http://playonathletics.com/userfiles/file/49522896189.pdf
    • http://teenmag.cz/userfiles/file/84978616926.pdf
    • http://jj-metals.com/userfiles/file/2021090913565873499.pdf
    • http://edilgroupdigiovanni.it/userfiles/files/bawukoselelamunizanafem.pdf
    • https://hurghadalife.net/userfiles/files/tepavitoj.pdf
    • http://sushimura1.com/uploads/files/54085550393.pdf
    • http://www.cerel.eu/images/wyswig_images/file/lugozujijumek.pdf
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/zibonelap.pdf
    • http://techbis.pl/files/file/59884326138.pdf
    • http://vnndt.com/Images_upload/files/51413463946.pdf
    • http://somkuthyoptika.hu/editor_up/fojuba.pdf
    • https://renewone.de/files/kumoredukekitut.pdf
    • https://cnn-logistics.com/asset/files/livawipejugosot.pdf
    • http://thienanglass.vn/upload/files/32713613180.pdf
    • http://cuacuonnhaxuongbinhduong.com/upload/files/mevizabotaro.pdf
    • http://drumlockingclamp.com/FCK_Editor_Images/files/kotijakorevijefaz.pdf
    • http://xedaphcm.com/luutru/files/8399127121.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd47a5b07---gozowipavebomasowotowuv.pdf
    • https://panificioilcavaliere.it/userfiles/files/59639026683.pdf
    • https://ms01bet.net/contents/files/68902684464.pdf
    • http://vmkmsz.hu/userfiles/file/sunakorewolofuxube.pdf
    • http://tamphuhiep.com/Images_upload/files/lurugokuwixejiboxujonug.pdf
    • http://bobiniauto.com/userfiles/file/gewufulewo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=build+ios+flutter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f7.bin
771098cc0195bc09bd66a1e91bbac34a23a3073dfa838f46e295b09851b0ff24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 18076 bytes
font_01_sfnt_off000106ee.bin
b93a5fcce1864a099d606b4cb3d71016779d05f1981ff31a06df515daa13b17a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 10232 bytes
font_02_sfnt_off00011e09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 16792 bytes

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