Malicious PDF — malware analysis report

Static analysis result for SHA-256 994fd7aba2fe3f49…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 21:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 878929ff3939d7eb8609922fba77e494 SHA-1: 15c1f6fbec89d19a4ce1e3a25f8d24cb5d7ea085 SHA-256: 994fd7aba2fe3f490ab47497dde8bb959e9a4a611efbaa6b0e11e611bc20b9a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=android+photos+trash+folder PDF link annotation
    • http://5lovestartw.com/CKEdit/upload/files/muzazuzadekexutejo.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79146923931.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/dc51102fd560a1b0d90a0130bf92855a/68501617029.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/1641612842.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/87582443283.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/nodevexedub.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/nopuxapobirilolij.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/97856500615.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/tovijegubizuxej.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/likefolulul.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/ginolajebozesobupixo.pdfIn PDF document text
    • http://arsvet.ru/img/upload/nonijaxotetoxomodede.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210910205031.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/mugorasiboxejezuju.pdfIn PDF document text
    • https://isosklo.cz/uploads/novarawoguk.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/23519673146.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/2625571393.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/kamunewikakazidodiwinal.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/63630292008.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bpjbb3l6isvr7dalncckqi6dmd/58106213216.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///51118507578.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/39080378953.pdfIn PDF document text
    • http://mc-opony.pl/files/file/miluje.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210919131556.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_off0000af30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF30 17264 bytes
SHA-256: 7db958ec28623014bb2ea66c342f12c9ed6800551ec8648374e6984c19f179b8
font_01_sfnt_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 10576 bytes
SHA-256: ee32fa6b1447198df4f27fc8d24609c116e679ed78a105ab56e4705dad6a68f0
font_02_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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