Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb482cc1bf3735d…

MALICIOUS

PDF

82.2 KB Created: 2021-10-12 10:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 556c61b3762bb87706e5c205729d5d51 SHA-1: aa0e563f298530eec47c6b5699082535246b1f8b SHA-256: bcb482cc1bf3735d44ab80bc7abe8a98d533429183df64e4589989c0c3b5915b
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a potential SEO manipulation or distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting a high number of distinct hosts and links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pro-group.ru/userfiles/file/44593119596.pdf In PDF document text
    • http://forestheightsgarden.com/ckupload/files/wasimiz.pdfIn PDF document text
    • http://retailcop.ca/files/mivopudilawubik.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/gexezuruzuxevubew.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/55143056687.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/gaxolasuvoxigosaniwiku.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/74217335444.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/gulakebegozipozazarebe.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/61676910393.pdfIn PDF document text
    • http://air-ned.com/uploads/files/likupazenuda.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/govupedibitopuvap.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/duzol.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/razibix.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/wasuxaxete.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dolitazirimej.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210921090016.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/95838751022.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/gegufimakebasom.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/babuxogejego.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/ribereg.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/7586296293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HKUGBsJGI0E/uplcv?utm_term=my+playhome+free+download+iosPDF 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_off0000d868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 10860 bytes
SHA-256: bf96632ca0b0e49b7838c405eb5b7d9ea1ea45c549e05c5e753d53696d23939a
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 19128 bytes
SHA-256: af13d969c6e7d5c58f4a5c18002c32231eb674d19699c83644ecdcb17e21913d

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