Malicious PDF — malware analysis report

Static analysis result for SHA-256 b079f91af0e73958…

MALICIOUS

PDF

87.5 KB Created: 2021-09-17 02:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65a26edfb4c8cd77c136a67653e870df SHA-1: e85aa47da28c8637e70220c86cdcc9e9ca85565b SHA-256: b079f91af0e739583c54f8308d9ada2b5bc3116496e4552efe5d41eea40224a6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Multiple heuristics indicate the PDF contains numerous external URIs, with one pointing directly to an IP address, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest an intent to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=best+free+video+recovery+app+for+android PDF link annotation
    • http://mamaskitchenorder.com/uploads/files/xigutemusemugujirumep.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/59309938702.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/gozasemowari.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/mujifezapisu.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/fijoxizudimadejuxetajol.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/42695746002.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/xoranatovat.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/bavagenoboloxeboja.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/besiwuvurizam.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/30626166363.pdfIn PDF document text
    • https://primer-spb.ru/files/files/xilidovutulofedinumil.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/bugerev.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-16/20210916043231524531.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/10474263139.pdfIn PDF document text
    • http://frchem.cn/upload/files/fifukepavulirorenaxupomab.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/31435341302.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/wogaxuvibididi.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/faxetovodudofim.pdfIn PDF document text
    • https://resicolor.com/upload/files/wemopixixapudarobodefapu.pdfIn PDF document text
    • https://citronel.com/userfiles/files/tetorenepex.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/muvokapibinomasaruko.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/joreruwakilap.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/bepozomu.pdfPDF link annotation
    • http://copingconversations.com/userfiles/file/1480247528.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/50668708901.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/64602252611.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/39275209958.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_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 10800 bytes
SHA-256: c3287bd1cfd72312ed6f825a4255f7b95073684a69f05d7584db0bce4fe2af77
font_02_sfnt_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 17332 bytes
SHA-256: 423f8f5fb9343a54404f7c1e3ab6a3254b5f26d14fb48a913d159437a8c3c55f