Malicious PDF — malware analysis report

Static analysis result for SHA-256 eced9e7507ba5b8f…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 14:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ad39848a37b3d998c7cc18dae6b7517 SHA-1: 1eebf4a0133da7de367eb773297f5561859dcc61 SHA-256: eced9e7507ba5b8fa0197cb4083ed9613f03a3167dd37824f1b53f961a29cb1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous external URIs pointing to potentially malicious domains. The document body is heavily obfuscated, but the presence of embedded links suggests an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=mi+note+10+pro+vs+redmi+note+9 PDF link annotation
    • https://xn--fiqa735be48e.com/upload/files/getinevisoxiroxogunivewi.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/45189595297.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/79455128694.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/fudujufonezujubejofo.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/52139693392.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109040914554599.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/57153347548.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/29221384867.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/jetetuzuxaposurub.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/62375937532.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/39536810162.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/18257743276.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/xewokigosireketugoj.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/63228621782.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bc8ea40cca64e700b261363c6532d9b9/40634784134.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210914155443.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/rirozon.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/51210520321.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210903235801552.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/58775350147.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a6f38d956b---97414901406.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/d09e5e321904b7f257d21533da8b3eef.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/bolonidigu.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/19227020458.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/53415202948.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_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 18624 bytes
SHA-256: 7969195b765107109133695c32d5cca22604d727b613e6c05faaf160e9ef240c
font_01_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 10744 bytes
SHA-256: 6f18e0d8be156d51948402fb6809a99c2d62cdf8467731364601fc2df8a1361c
font_02_sfnt_off00013710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1