Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2324f81904f2175…

MALICIOUS

PDF

86.5 KB Created: 2021-10-08 20:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 173db9f735e4cb9504eb9dedbbc66035 SHA-1: 284f4de0ec9182b06357541a4810ee715f3d03ea SHA-256: f2324f81904f2175ddf535fc5892c2b407315e08fb540e4fbb83bef40f6c0c2b
126 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. It contains numerous embedded URLs, many of which point to disposable hosting or are part of link farms, indicating a phishing or malware distribution scheme. The PDF structure itself is also suspicious, with multiple external URIs and a link farm heuristic firing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://catamma.ru/uplcv?utm_term=difference+present+participle+and+gerund PDF link annotation
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/32084438191.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/bepexagupo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hagkaa91u7tnggi2oif6959nb1/fivedununifijamafugodu.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/kukiripido.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/jerirafux.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/26120090277.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/joleretatavusijuvozogajov.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/22125730850.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/vimazem.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210906024848.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/sigaxodixe.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915c7c2170---fabuzujofi.pdfIn PDF document text
    • https://ibextrail.com/editor-images/96218124076.pdfIn PDF document text
    • https://riwg.in/userfiles/file/wewevun.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/84957190211.pdfIn PDF document text
    • https://cet.sk/res/file/64885142161.pdfIn PDF document text
    • http://ipceurope.be/assets/file/63192312275.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/95458331883.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/gazefaxilugegagepuko.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/weminomo.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/fuvexoxeborof.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109281121446323.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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 20184 bytes
SHA-256: 84636556662133709447ca05b48ecdc8288b80bf244069090eea0b94952be33b
font_01_sfnt_off00011b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 10776 bytes
SHA-256: 8a3bda782e792edebc13f995ea321881b3df3c45b16a5ace12892e966b666575
font_02_sfnt_off00013430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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