Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e841c8133cf5593…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 19:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9193658cd976ce2a30bf07efbc0dc6f9 SHA-1: 285a4cbcaee2617226cee7b9b2ab87e6474ad1e8 SHA-256: 7e841c8133cf5593dfce61b89e30a9be73fe9223314196c46997425a7372e2af
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to potentially malicious or phishing sites. The presence of 'utm_term=scan+qr+code+picture' in one URL suggests a lure related to QR codes, a common phishing tactic. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://huntic.ru/uplcv?utm_term=scan+qr+code+picture PDF link annotation
    • http://happyorderfood.com/uploads/files/47712623756.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/92611717263.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/97219665368.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/maxasiperux.pdfIn PDF document text
    • http://vaithun.net/upload/files/wewesazokuxemulagi.pdfIn PDF document text
    • http://holzweiss.at/kasivixubaba.pdfIn PDF document text
    • http://sissonne.hu/editor_up/6315734378.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/buzupudeso.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/xunatuvuvutewodomebomati.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/7954683006.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/xuneguzujonigatisifalaz.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/porelizasud.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/9110547533.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/1061566215.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/xadajupugegubifefono.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/90147866241.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/vorasewu.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/85943655835.pdfIn PDF document text
    • https://pecintajp.com/contents/files/pakilujakefegezotoja.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/93908782102.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/87567576834.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_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 18332 bytes
SHA-256: b74220498c35a3925cc2b0122da80764e2077bcff6130480551726d453e3ca43
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 10612 bytes
SHA-256: a6ee12fa90a9a657bb856d18a1683162b148783188d8248e494fe2e98861a6a0
font_02_sfnt_off00011e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1