Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bc2eff62063be7…

MALICIOUS

PDF

88.6 KB Created: 2021-09-21 05:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f292d192ea2b96ed543b366d62b5f285 SHA-1: 4c85f0b56be44a13f245be00d35134d8a999a23d SHA-256: e9bc2eff62063be78512c787fa0224db5a90e64b16921444559c2e08eadf7f84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm with numerous embedded URLs, many pointing to potentially malicious or unknown domains, suggesting a phishing or malware distribution scheme. The presence of a disposable link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://majubesar.org/contents/files/21882605793.pdf In PDF document text
    • http://rococosofa.com/files/files/wulefewibapepipi.pdfIn PDF document text
    • http://nenorm.com/files/files/49098684053.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/xutufosutonuxivipoverike.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/tojuti.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/54783708779.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/pezotoxedozo.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/45619451367.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/rezafob.pdfIn PDF document text
    • http://afslab.asia/upload/files/94803408029.pdfIn PDF document text
    • http://friulanapanini.com/images/file/78040022493.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/24220148031.pdfIn PDF document text
    • http://chieucoingason.vn/files/zadimoborevuwovonimagoke.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/jalefutabediroj.pdfIn PDF document text
    • http://a-pluset.com/userfiles/gaxofu.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/66964213195.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/lejitun.pdfIn PDF document text
    • https://sim2007.com/files/66090213347.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/59594510602.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/12830858586.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/96940830061.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/zajokanago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=monday+movie+watch+onlinePDF 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_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 10624 bytes
SHA-256: 09418e17ed2eff1e17935b0e2fe4eeb39a7fb61f466e65663ee1801f31a9e7e0
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 17804 bytes
SHA-256: ca2a2b6fda414b9ea8a298ee75a1795c8b5d6065b1f3ced43952272c50ff05fa

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