Malicious PDF — malware analysis report

Static analysis result for SHA-256 6054070f542fa066…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 14:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6777dd14d4b64bb0959ca7092c433ef1 SHA-1: 278610fb01f446b2457bed877dc83062f6d9ada5 SHA-256: 6054070f542fa066147a4f343fc0de90488b726fa9e35a7f129fcdf2ea1c8c07
146 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, some pointing to IP addresses, suggesting it acts as a downloader or redirects to phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=steam+link+download+apk PDF link annotation
    • http://architetturaurbanistica.it/userfiles/files/sikupegepodonexuwokuwa.pdfIn PDF document text
    • http://all-premium.com/user_file/files/14154318008.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///32262054392.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/judizu.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/6603456528.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/wopejisesodoxotivixogetal.pdfIn PDF document text
    • http://vititanon.com/user_img/files/56448766526.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/kifapijejegafi.pdfPDF link annotation
    • http://contua.org/userfiles/file/83005516415.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/vorirat.pdfIn PDF document text
    • https://bursac.net/userfiles/file/12347365237.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/gekitozeduvavijeraza.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/tolorukijedepufasutob.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f3119456536aa736ed9b7ee4f23ba95d/76907423546.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/16844552551.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/patevi.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/23861248232.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/gatogameruzofexa.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/biborurojoxegilod.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/99111943214.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/16108232991.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/lanopikafaxukoxebiwowuvi.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_off0000ac38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC38 10536 bytes
SHA-256: a820c9286c2a4b5aa8796b2cbb19c9d3fe07101386af69311dcd08d58eb877a4
font_01_sfnt_off0000c438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 16800 bytes
SHA-256: 4505429c91dab3bf4ab8e6ec481347e4615867f0661937550d7b6af38dae0ebb