Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2835334b52b7f0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 10:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 225bbd3b364238d980eb67f770bc4671 SHA-1: a90177bd754ec08bc060c42e6880378604808da4 SHA-256: 9c2835334b52b7f07d3416bf6a7f57aa3d9d77f6fc13c2b7e3fc334d8923323d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://infrive.ru/uplcv?utm_term=channel+9+live+stream PDF link annotation
    • http://celcg.pl/uploaded/file/leroxivej.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/78470113179.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/zonadanivorivukowip.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/66620046356.pdfIn PDF document text
    • http://llux.vn/uploads/files/15401493041.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/44342712537.pdfIn PDF document text
    • http://rayanchem.com/d/files/88208222498.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/5249989938.pdfIn PDF document text
    • https://unaizahic.com/Files/files/gitami.pdfIn PDF document text
    • https://masihpt1.com/contents/files/54654533105.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/fifur.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/paboxarubizudaxuzuna.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/41542746576.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/89729140617.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/ferijejoruburuvepejofiz.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/76871316438.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/11276304374.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/lopezimura.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/sepiwes.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/rokobinelemep.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/41534996557.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/2113560307.pdfIn PDF document text
    • 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_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 17476 bytes
SHA-256: 4ae60a26942171562af3405640a9a92f817bf4e48400c92e2580fe902fed5c22
font_01_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 10516 bytes
SHA-256: bf8f512ca2980586fd783ae8420fb1df84315a843aecce37f00a914bdf2d0481
font_02_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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