Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61e4a0960d6edb2…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 06:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4de917bacc1737e52872342ba046a99f SHA-1: 87ba43258f134897fe751b6d95babe1b61745c37 SHA-256: b61e4a0960d6edb235e5ce7a62554e2294b04c502e15b76afed5b39ea7b7c475
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of a link farm with numerous links, many pointing to disposable domains, suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with known phishing lures designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://heathrowairporttaxi.website/userfiles/file/82931344637.pdf
    • https://dialogueinpraxis.net/files/docs/30599550444.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/lidubuja.pdf
    • https://speedwayinfo.hu/uploads/file/53291198919.pdf
    • https://gangwontaxi.com/FileData/ckfinder/files/20210924_3AD6DB9E4F6BC047.pdf
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/degunifuwakumexupusezimol.pdf
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/18547054025.pdf
    • http://humanitool.ru/userfiles/file/lameditepuvafizifo.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/91925801088.pdf
    • http://studioriboldi.eu/userfiles/files/jogum.pdf
    • http://aasghsflqsae.handylover.com/upload/files/nujifejutevaginije.pdf
    • http://tccsrl.org/userfiles/files/radotasaz.pdf
    • https://fertilizerproductionprocess.com/d/files/vodolekiva.pdf
    • http://lutechmed.com/Images_upload/files/padagenodev.pdf
    • http://sportingfoundation.com/uploads/file/13316227790.pdf
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/nawomuwasepujitaf.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379a24ca4da---27751001845.pdf
    • http://kabaretyimpresariat.pl/Upload/file/fipuxefebejavuleze.pdf
    • http://dichvumucin.com/upload/ckupload/files/78309404597.pdf
    • http://eva.am/files/a489deba9f9d9e54.pdf
    • http://kmjmt.com/news/upload/file/2109071949595782473vwzt7.pdf
    • http://dgjinhak.kr/DATA/upload/files/202109250721597211.pdf
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/7085972776.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=jiosaavn+apk+download+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF51 16792 bytes
font_01_sfnt_off0000c768.bin
2a02447541dbc3415cb563d6d9895f542e0eb10db7f8843d6ba056c63b565c99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC768 10532 bytes
font_02_sfnt_off0000df8d.bin
246dcfc37ec184d40a67e81e270f5cf7cecd3147f608130c6949e3f6ed585e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 18332 bytes

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