Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bbf0ad7a503a27…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 04:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cf85e43f44d7255f478044b67f26382f SHA-1: 8b1ea3d6d75ee67292d47e84a9a4aa26297125cc SHA-256: b1bbf0ad7a503a271a7eba4c03a5f38eaeaa148e90dfd7b7e56e652c71af1747
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics suggest an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://stradatextiles.com/upload/ckfinder/files/pulixebujozezisifasele.pdf In PDF document text
    • http://dansecyr.ca/pdf/file/62781286864.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/pemakozoxok.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/55340270939.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eae2d4191b---69289545577.pdfIn PDF document text
    • https://telorgabus.com/contents/files/99637407484.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tumejamojuzidebilu.pdfIn PDF document text
    • http://proart.by/media/file/rabirenewunepajukulo.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/jiwobilibalexad.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/31331284928.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/12745085480.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/gunekajetemetolelasipawa.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/51730502040.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/finuko.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/95339043827.pdfIn PDF document text
    • https://groupits.cm/uploads/fck/file/fopiduziwovuvuzekokeme.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/76807144500.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/89913660400.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/77613576772.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/83755385292.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/13855172899.pdfIn PDF document text
    • http://irc.kz/data/content/file/wekebepivesetovudujixad.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/79914375441.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/62927933199.pdfIn PDF document text
    • https://kvizek.excore.hu/ckfinder/userfiles/files/mukusonokafopelepex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=always+on+display+pro+apkPDF 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_off0000aff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF8 10428 bytes
SHA-256: 03f72a9cca4e9e5207b04cc99d952589c37b7ace84ae1c8874da42b8a7004917
font_01_sfnt_off0000c7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 15080 bytes
SHA-256: 56b06936a56a267b7d031115bf579f81d514f8a633086824494dc6b368fcac3e