Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9be5853395d16e5…

MALICIOUS

PDF

89.4 KB Created: 2021-09-19 03:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88497eae3e5cac7fe68dd2d9aae90f5b SHA-1: 55580bc52d367c57811ce7be87df2b4c290b2f21 SHA-256: e9be5853395d16e54a363b8d6423e43870c0b8131ca3d2ccd8d782771064e962
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The presence of these links suggests a phishing or redirection attack, aiming to lure users to malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=bo3+pc+gobblegum+hack PDF link annotation
    • https://toppelletmachine.com/d/files/kifesasawipuvimizusalog.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/15933542703.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/bejevemomenixaxedola.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/26768834930.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/kikanetuwoxudexerid.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/tobirefiturozawem.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/paresarodipepaxar.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sfo6g4ksvmrhb85n1n7fh9udp2/61248451691.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/zenupomumixikibixiwesigu.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/dimazekagoz.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/lusidavudixipulekozeribi.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/buzavebuxarikobo.pdfIn PDF document text
    • https://fasleh.net/Files/files/99852076441.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/81035765922.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143e92dc30f9---61488386691.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/xagokedi.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/43388209974.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/zedabojeleg.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/zanipo.pdfIn PDF document text
    • http://talleresjpg.es/img/file/86532551788.pdfIn PDF document text
    • https://chineseclothingonline.com/File/60187684143.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/sesaf.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/85462855183.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/numisoni.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/11711411346.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/6174006081.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_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 18512 bytes
SHA-256: bdef51a59ac23eaf62c1c56a2048026b86686bddbf2ba35e419a799e372a0a53
font_01_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F37 10816 bytes
SHA-256: 57f12aa09a10951791d46c04e8167c4777b735c2fcdad753bc0f9681fbd794c4