Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae584a1dc00598cd…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 21:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6c180a1df8e99796c7b7f59057791c5 SHA-1: 2705fb0c496ae8989db84030fb1f33c40cf5bc20 SHA-256: ae584a1dc00598cd4a07e6705664346b0af7300bdaff6e0c16fd77a262daad2f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. The embedded JavaScript stream and numerous external URIs suggest an attempt to redirect users to malicious sites. The PDF structure and numerous links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rallstarawards.us/nbloom/fckuploads/file/41186610596.pdf In PDF document text
    • http://fotocaroli.it/userfiles/files/sarasisumixuzumutokugoso.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9a9e6161---20614136604.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/zuposutenudurixujadeji.pdfIn PDF document text
    • http://trovas.com/userimages/tofopebijeso.pdfIn PDF document text
    • http://industrialdevices.in/uploads/powunas.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/1763372107.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/5683467118.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/mutipibaxenul.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/60417003672.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/21258468630.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/jisasumewojide.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/85272632398.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/33403222114.pdfIn PDF document text
    • https://protrialse.eu/files/files/56590946329.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/nalemerinozuxowixugixokaj.pdfIn PDF document text
    • https://sambelteri.com/contents/files/gokewuzodiwonekal.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/1197333584.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/79611992292.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/95505998175.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/99219946707.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210903_A17FD0FE512BF842.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/kasano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wallpaper+pubg+mobile+hd+for+androidPDF 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_off0000d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 10912 bytes
SHA-256: 6cc3504e236e35f5f6e882b5d9b43d356bd56a7f52401d6342c07a817c53cab8
font_01_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 16868 bytes
SHA-256: a27542ac1756ae1e99004b67b6cdc9326801729c58ce442db5239ef16fd77d8f

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