Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f68d0378a312a51…

MALICIOUS

PDF

78.7 KB Created: 2021-03-23 23:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23c842f7a9abdc3cb46ccaca36919d03 SHA-1: e03248a4a872796d40ac9e269aa006bdf74f3c7c SHA-256: 9f68d0378a312a514849b076886c83184aa603d77bddfe56b8a04a1204039ed8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, forming a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'core java tutorial for beginners with examples pdf'. The presence of multiple external URIs, including those hosted on weebly.com and other domains, indicates an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=core+java+tutorial+for+beginners+with+examples+pdf
    • https://fakipaga.weebly.com/uploads/1/3/1/1/131163599/nudoposozaket.pdf
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/dujopukovet.pdf
    • http://lamejix.scienceontheweb.net/20112171995.pdf
    • http://julivojurukumu.sportsontheweb.net/95698771821.pdf
    • https://kuvanipugeva.weebly.com/uploads/1/3/4/4/134445248/retodopos.pdf
    • https://xazexotuxumuku.weebly.com/uploads/1/3/4/7/134719447/1000383.pdf
    • https://wifadesar.weebly.com/uploads/1/3/5/3/135345928/wuwelozawitilaw.pdf
    • https://fupixadig.weebly.com/uploads/1/3/4/0/134096542/netuxolajipulis_separajamelaji_nogidorevisogij.pdf
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/9500336f.pdf
    • http://lowufadit.scienceontheweb.net/hyundai_avante_xd_2020_manual.pdf
    • http://vepenuvix.mygamesonline.org/kowamusofosalija.pdf
    • https://lerekisisag.weebly.com/uploads/1/3/1/4/131408666/noburumupasubosafemi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cf726529-c31c-40b1-98f9-acb17be83a0f/15559822540.pdf
    • https://s3.amazonaws.com/jaloto/tesogegufujujaluselal.pdf
    • https://s3.amazonaws.com/jiwisi/lucky_betting_tips_vip_apk.pdf
    • https://s3.amazonaws.com/bipovoromoj/vilamekefofug.pdf
    • https://s3.amazonaws.com/gogunabones/human_body_worksheets_grade_3.pdf
    • https://s3.amazonaws.com/tokatefozude/championship_manager_93_full_game.pdf
    • https://s3.amazonaws.com/jiwisi/harvey_rosen_public_finance.pdf
    • http://xuvuzonixo.onlinewebshop.net/95833382157.pdf
    • https://s3.amazonaws.com/lomuper/wofakafonux.pdf
    • https://s3.amazonaws.com/bodajaku/50053003364.pdf
    • https://uploads.strikinglycdn.com/files/f002f28a-d887-4ed2-a8ed-712fbe60386d/xuwutumavomalivavisusibis.pdf
    • https://uploads.strikinglycdn.com/files/7df96fd8-0299-49c7-b0ba-807f994eb1d8/how_do_i_find_the_pairing_code_for_my_vizio_tv.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35d.bin
a03a8286e6be8bab0a4b1d2345dad66a508855170d0d00e4d714894b748b05ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 5796 bytes
font_01_sfnt_off000106fe.bin
4012278f32679d89a65ddb1d8738fe93201645dee8112f5a4a11a6a95b44e80e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 11220 bytes

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