Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4cddd2ec57714c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-15 11:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b465658d2379e314aecaa824cccf757f SHA-1: b8f6550ca93b21b73571b8d0b35283201d6d93da SHA-256: 9a4cddd2ec57714c80295abe013aaa89d41cf56e971e20199a893bd75770bb62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://videotour24.com/data/fckupload/file/suwudotedoluxataziko.pdf In PDF document text
    • http://speckletrack.com/update/editor/file/wonexok.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/83408721364.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/54447206190.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/93174930605.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/jozililonal.pdfIn PDF document text
    • http://schokofontaene.de/idata/kavupixumanikiritokigad.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/42028587950.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/lixizipabogifuzibufapafe.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/addd31da7315e3ee6572b5d315fe4bbf/xivogexofor.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/42251738544.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dumudeloxubanojixinibuvun.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/44620629612.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/nodakitifiv.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/vejonedom.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/rozusurevikopibesolevures.pdfIn PDF document text
    • https://salwangurugram.com/files/rimajawuzunij.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/59372135631.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/92201619787.pdfIn PDF document text
    • http://ropesadventure.com/d/files/gizebepa.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/mubexozepudejizuz.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/38968774128.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/9639537457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=egg+inc+apk+modPDF 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_off0000b8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B7 17016 bytes
SHA-256: 785eed84980865cad6b87584a06948741760e374129f732974d3fb746483d5d8
font_01_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 10388 bytes
SHA-256: a4f2618b31664b62ef8fe332d977a7154d10a74ec48bf15be4b9c01324d80bbd

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