Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ac5e84e92f8b33…

MALICIOUS

PDF

72.7 KB Created: 2021-09-14 04:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c94fb3ae26f772d9b56104fbd84e380 SHA-1: f4ea269394029f16a5c396f5fc19cc2cffa5b60e SHA-256: b9ac5e84e92f8b338ba09717a8ad9f9c4c0d3d47672fc92166497af16b6848fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to other PDF files hosted on diverse domains, indicating a link farm or SEO poisoning attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern, suggesting the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://maxbrio.kr/files/files/zakanisuwawamada.pdf In PDF document text
    • http://ndc-group.ru/uploads/files/48656735501.pdfIn PDF document text
    • https://questyme.com/userfiles/file/56442247609.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/bisotomilozajonizu.pdfIn PDF document text
    • http://benetalent.com/upload/files/fabeziroxijibuvew.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/68187427514.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/zilidodirezu.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/gujopizunepobebipoxeno.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/daluwuzitorukuxugagowigo.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091317054681.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/84493303987.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/kepugobexivusisivupolure.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/kuzojorurureturibivoji.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/87632596592.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/97105646818.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/26971516378.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/43315402280.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/dui49mpsqitg0hcbof85ve2497/73835810364.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/2056292185.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/tigofigasemibeke.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/93406764165.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/62090268397.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/lofebopumukipukoron.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/70960132810.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210902072808.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/gigin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+hide+my+mac+address+on+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_off0000b8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B3 16936 bytes
SHA-256: 1318881197cdc18b2f686631d72fa0c581672a7d2a679b4c7dc17e1c8f1f7107
font_01_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 10780 bytes
SHA-256: 89f45ee5d8357965e205473a3c4514270cff5b75d63e177ca4be9bb54d1307cc
font_02_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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