Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a685bf9f8b06bc…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 01:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8b871b8ba8c9a4cc306258bf95976d0 SHA-1: 9eaf57d5ae560c1832a06c83256f8c4dad441fc4 SHA-256: a6a685bf9f8b06bcb90ade79392100e337851421a6ad49637ba3a94ba4fded68
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to potentially malicious domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a link farm designed to redirect users, likely to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=youcam+perfect+pro+mod+apk PDF link annotation
    • http://ds-dq.com/uploadfile/1632765974.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/79673825254.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/kinaban.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/45325293101.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/13306509213.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/safagomerixupexu.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/sidonupurukebovujoz.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/gakufusetezalaloto.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/32941679317.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/51603124550.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/jotewuwedipujimoropo.pdfIn PDF document text
    • http://unsersohn.com/images/file/bimebakasasixejojajeju.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/kufilivifadazojutusez.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/rodokafejojibajo.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/zuzaxewifuzumal.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/kebonalusar.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109251538162628.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/dorupugadolugapudifa.pdfIn PDF document text
    • http://coumert.com/images/file/rovubasepifulenopew.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/58381230008.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/9a5i47onu23epsgqprugtq2mi2/9090576666.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/71311541135.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/kerurugumev.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///58236792052.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_off0000b2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 16848 bytes
SHA-256: 11f519e6ac4ef091ad59323805022dd73f6ce5ae6931b5a12f12dc4470b62be3
font_02_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 10544 bytes
SHA-256: a5d6b983d942c8f12b732ae2223173ebafbcf6b221d515ddb7ab5f1e262125fc

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