Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bd74395355bd45…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 00:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 438ae6a51b92105c287d36b91f36af1f SHA-1: 30624784c7f71b22d0470778a25439eb2f7d7ca2 SHA-256: 48bd74395355bd45572750e3a0685f91fd77b7c072f1ba906fbf3668d334d1b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external resources, and a heuristic identified it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL distribution strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kasand.com/userfiles/58474384391.pdf In PDF document text
    • https://nada70.org/userfiles/file/mowepizemidavoxisogeri.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/62032777407.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370bb87cd86---52350029746.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/87303557819.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613fd9b46f21d.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb5b7cfaf---18838402366.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/tuzojuzikutudexox.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/jafoketotixivonanoku.pdfIn PDF document text
    • http://susutour.com/userfile/file/jupimilobuvoragewavunirod.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/34718579125.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/vefupobinolol.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/97442575529.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/bilul.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/wesawu.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/nitujuduka.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/83248535607.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/12968129898.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-9/20210909112657900185.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/9183509138.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/todolez.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/54500328328.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/71503894213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=boxing+prelims+tonight+channelPDF 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_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 10976 bytes
SHA-256: 6f2671f18003ee8cac64fca646098ac3f06bb2f026c789a2bc4b49edc6160109
font_01_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 17692 bytes
SHA-256: c39dd6495b27b96da968b85d09bcae7de200d5101b69acff35c0a38235cd934e

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