Malicious PDF — malware analysis report

Static analysis result for SHA-256 033db462ccb12eac…

MALICIOUS

PDF

92.0 KB Created: 2021-09-15 21:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e773a1f4a5b5be5eadf7980467fb8525 SHA-1: 211b25b06d466a5adc30101df12954400c679d20 SHA-256: 033db462ccb12eac9ebb6992503068b7d56fb768820079772d980688843ffb42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the PDF structure point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://drafthe.ru/uplcv?utm_term=people+with+android+fat+distribution+carry+more+fat+around+their PDF link annotation
    • https://qnzar.com/files/sufudonomurofonaliza.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/fazusetiligub.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/sedavoxobizodopod.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/turejelerotubipipop.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/79824281789.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wawalaratalapefeditinapo.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/rewosi.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210903212429.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4d8e27c6---33558491317.pdfIn PDF document text
    • http://teresachild.com/upload/files/24429952530.pdfIn PDF document text
    • https://ksuskalology.com/images/file/88544125587.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/wozaxerabomuvorufuxivama.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109091145516553.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f198f18870---80769299837.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/foxibezanapowurexizani.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/48700123516.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/wijubevojeko.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/fikiviporuroro.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luvuxipu.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/21295876513.pdfIn PDF document text
    • http://contua.org/userfiles/file/43726506121.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/50801589705.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/kopifadusewu.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/jakixurinenakonakunepoxek.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/10988029623.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/judid.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/xegosinagufewabumonaka.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_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001136e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 19096 bytes
SHA-256: b76f69432e1b7c1c01267eda48e3041ff448e5de925000ffa14aaf1d24b78d39
font_02_sfnt_off00014598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14598 11328 bytes
SHA-256: ab990b3facc31682eed005b58a91f2961ea835e24b772cec953c05dfa0cd15d5