Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe6dcc863516fc7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 22:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04c70b931a00bd211ec2d78e30577465 SHA-1: 062fb71157f891213b8614c837e1bc7af71104dd SHA-256: cfe6dcc863516fc78a0c31f903e0fa74dfac83dc2fb71d47676325eab7e7a36d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs and link farm heuristics suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a lure mechanism, likely involving social engineering to trick users into visiting malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=scan+qr+code+iphone+5 PDF link annotation
    • https://sanruouvang.net/images/uploaded/file/faxamukalidawikase.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/lukuganisafuwij.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/nasomaw.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/ramefuvuzatu.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/sujixaxinaderilofopobun.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zesazo.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/jimuvovitusafepitelerax.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/kavuna.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/71613284328.pdfIn PDF document text
    • http://cocoal.com/uploads/file/budetusi.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/zopoxujoniwivajugobu.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/14769846425.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c35725b433092a3cf560a8f026f1636/libum.pdfIn PDF document text
    • https://duel.pl/userfiles/file/36558871607.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/70773734072.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/3488552079.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/zarofunozibuga.pdfIn PDF document text
    • http://wernitznigg.at/files/kugusewipexitavofa.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/zivitegodot.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/vapizodel.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/tusagos.pdfIn PDF document text
    • http://test-immo.com/file/22017389117.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109011345235261.pdfIn PDF document text
    • http://prota.ru/upload/files/31842107030.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_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 10652 bytes
SHA-256: dd82feb0fd5bb3d15edae69c1cc275f16ff6ad951eef40a59b972dd0ff40bc36
font_01_sfnt_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 18592 bytes
SHA-256: f6daadd32ed4173e3f038d43fca80cec2a53a7ccb4cf9e928c9baeae0377ba71
font_02_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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