Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80c960372d7f9cb…

MALICIOUS

PDF

68.0 KB Created: 2021-09-30 10:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 479450fe40a3e370e7ac597c08e0d080 SHA-1: 8ee76a540d465ed00939c02ac24bc79440ec621f SHA-256: d80c960372d7f9cb17b62bc510d50fd6670141e23fc02050db62ee9076cc1147
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 numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a large number of links on low-reputation hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pistant.ru/uplcv?utm_term=onmovies+apk+free+download PDF link annotation
    • http://c-six.it/userfiles/files/60236707948.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/vikosalotelidovum.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/febugolomapesib.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/460ca41612ca579ba247cac1309a9026/reran.pdfIn PDF document text
    • https://el-tall.pl/pics/file/bebiroguteranuvikexidelis.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/579fa7018ecb18f0829755ae5386af3f.pdfIn PDF document text
    • http://vtaky.sk/media/file/9114843556.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/navibozotawisoromozug.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/4862189369.pdfIn PDF document text
    • http://sushi-belovo.ru/files/16652346019.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/73567075335.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/47656735246.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/jofezewoverediwenorawova.pdfIn PDF document text
    • https://breedlife.com/upload/files/80117824866.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/96261747959.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/40974997242.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/gexazox.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/zefemomizutefibibotep.pdfIn PDF document text
    • http://metabolit.ru/files/file/49876314654.pdfIn PDF document text
    • http://offerparts.com/upload/files/suzedagozura.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/61326086866.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/24375732926.pdfIn PDF document text
    • https://sunrisemotelbellevue.com/nbloom/fckuploads/file/xigogesosu.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_off0000ac0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC0F 14944 bytes
SHA-256: f325c3dcc485288819b447e2df304b363e5164e7cd6917679f394f0ce6d395c8
font_01_sfnt_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 10832 bytes
SHA-256: 278d52b1657f1673f695d477e38ef67ba9f79b6f33b17d542e8fd6ac49f3ea81
font_02_sfnt_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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