Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ba52e4002c15d1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 06:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4b558a34fd1a376204171509fb4164fe SHA-1: 6e528903f73e22c94b7ad1d284807873656c3f69 SHA-256: 37ba52e4002c15d164d239a959299bad82e8412d6c4d33be63485ae83d1025e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no scripts were extracted, the presence of numerous embedded URLs suggests a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vom-ragnaroek.de/uploads/file/junezililujumuvelosemal.pdf In PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/25110397936.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/74753130524.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/38386824060.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135079914aaa---14450815386.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/gibipufonagorifaninorove.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///xadovezazadurapuzozer.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/medorajil.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/74d85efb4779d3a7c9bf1cb3cc210232/17206731122.pdfIn PDF document text
    • http://citra.cl/userfiles/file/ponuzukekaz.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/ludonodovexalisukoraz.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/lokagakix.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210917181515.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/36656794250.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109151200432611.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/19/83099597632.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210916101403.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/zakodiw.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/63919280731.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/purifekuxalonerudikiwut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+binding+of+isaac+mobile+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_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 11064 bytes
SHA-256: ce04d1463b561a8b96f5e79e01011f6df94952830193292b77a6bd1d38fa3baa
font_02_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 17716 bytes
SHA-256: 8b36b6c59be967c30f03abe43a6f4b9d6a4fb318f957ba008a684af72753f0d1

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