Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf2322b82747ee9…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 20:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8d4a646a695e6935beadbd811dee8399 SHA-1: 0d945fd270c5631c455a7fc2833ba358642acfcf SHA-256: 8cf2322b82747ee96b063b10db493a374312d5ee482391313e31a48e6484dea4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to external PDFs, suggesting a link farm or content distribution network. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a potential attempt to manipulate search engine results or distribute malware through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pre-www.bridge-college.com/uploaded/ckeditor/files/wowalaluxumagoj.pdf In PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/26261677375.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/xevonukesijadepanezuxe.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kitozoxakesosimegipebunuw.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/wuparakijojeruxuxutadiz.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/tikifidu.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/79973644418.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/liwasoxibemubibadejerot.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/difikeferu.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/95249861917.pdfIn PDF document text
    • http://telektrans.hu/editor_up/93611080990.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/17820596040.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12e306581b7635bcb3952b3e99ce689a/22869164804.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/17526496189.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/23849816350.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/51979034512.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a17bcaf35---27694917761.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/76367562101.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/77187788313.pdfIn PDF document text
    • https://icbacademy.com/upload/files/rujexu.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/fasarunademekap.pdfIn PDF document text
    • http://farmina.ru/uploads/files/4261586737.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/36467014504.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/wixiveregekag.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/mawaxomotixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=my+talking+tom+2+game+download+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_off0000ce5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5C 10872 bytes
SHA-256: 50046d25576446ee2d2750968578daba65f1ab78abd028998ab9109f1e269ce0
font_01_sfnt_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 16504 bytes
SHA-256: 0ca122bcc917ad74f91f169e6e85b1c096ccc52d2142c8e32fe9b7f316013ca4