Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b0936f08aa7249…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 09:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1c13e896fad32e79aa8b4a0e9d51c963 SHA-1: b3e21cd67c1ab3bfa66c7500449ccdd4c08a51fe SHA-256: a0b0936f08aa72491dd6dc668ab02c9fb9abde1c9ee8acf0921f60ee491801cd
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with ClamAV identifying it as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, one of which is explicitly identified as a disposable hosting link farm. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ifap.it/images/file/xogokenepunologixaze.pdf In PDF document text
    • http://www.mediagrand.hu/data/editorfile/belenizigawumi.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/39297333670.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16312141441429292254.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631121597.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/fimugemewurowun.pdfIn PDF document text
    • https://insp.biz/img/file/wubutadetaluderona.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/48439712250.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/rawebidepowumajikibanut.pdfIn PDF document text
    • http://fleseriuassociates.ro/files/file/8205642388.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/wopen.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/17296011506.pdfIn PDF document text
    • https://mahae.hu/files/files/detafalazuwukega.pdfIn PDF document text
    • https://cristalensi.com/public/File/3492565640.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97245d9bf8f7d3010bee2abf465c70cf/jarof.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/6359601859.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/72031002094.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/27535440284.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/dogerujazosepijomukij.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/86853117319.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/97875097080.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/053246f78e465a000b1985cccae7ce6f/sabevode.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/migedivasumizutesunirekiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+my+phone+auto+rotatePDF 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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 18744 bytes
SHA-256: ae588ba877fc1108a8e1d6cb744fa0b7bfda9ac110ddc30239e693e34d81a7fc
font_01_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 10596 bytes
SHA-256: 4889e8edea450dfcf6379e346f0768c4e9760ce69b548a40e861d2d4dbfd221d
font_02_sfnt_off000129e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1