Malicious PDF — malware analysis report

Static analysis result for SHA-256 21813a1e5e734977…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 18:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02f1f309612ee77dc1323eff49ca8f19 SHA-1: e1fc84923f6c95f415a3dd80e11c45004fcbfbfa SHA-256: 21813a1e5e7349779bb5b1bc7d3d72c1e0101e73c12121ea8d9016a70c17bb6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links to other PDF files, likely as part of a campaign to distribute malware or phish for credentials. No scripts were extracted, but the embedded URLs point to a variety of domains, many of which are unknown or potentially disposable, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://cpils.com/userfiles/file/94159481748.pdf In PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/8614795323.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/keduxukozulabik.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/42802316192.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/88171767116.pdfIn PDF document text
    • https://bloomeng.com/uploads/22763079923.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/kezusatel.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/88229842763.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/40990553986.pdfIn PDF document text
    • https://morabia.fi/images/file/44865919064.pdfIn PDF document text
    • https://subded.org/userfiles/file/jewevijufasadexu.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/kajekofuxovugibomaxew.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/16831464625.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/jagelotozalumado.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/welalidusefu.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/25470122379.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/25942140335.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/37628659652.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210904192136_159975.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/bilotujejodomatub.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/3339921225.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/54128687181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=live+football+tv+streaming+hd+iosPDF link annotation
    • 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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 17704 bytes
SHA-256: 92dae39d0b9134ee19a7f9e48107122e3e0add7a012bea76995e830d17e22052
font_01_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 10964 bytes
SHA-256: e904da84e705c0b6ce63fe2571dd452cc12aa0183092bbcd5a8b6ccc75fda6f1
font_02_sfnt_off00012413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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