Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17315a94c887bdb…

MALICIOUS

PDF

67.5 KB Created: 2021-09-24 23:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1aa757f2406eda07e152b97314ff375b SHA-1: b19077e4cf40f292319133c37187c00abfd352c1 SHA-256: e17315a94c887bdbac91552145162f22d75ab66efc5e1ef326b9b7fc852fbf11
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect the user to malicious sites. The document's structure and small size, combined with the presence of a click-outward action, strongly indicate it's designed to trick users into clicking a link, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=android+unread+message+count+wrong PDF link annotation
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/73301922764.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/tuvesoluzozagexifumirem.pdfIn PDF document text
    • http://imaginove.eu/data/Files/93080441505.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/pogoguzilur.pdfIn PDF document text
    • http://sro52.ru/uploads/files/66614427860.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/38025102376.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210911205232-kusugerazofinod.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/pelutazurix.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/10162263911.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/dilemiv.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/dufokini.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/musuzegotaba.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/1662036262.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/bigumozizib.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/sirezokutivutofe.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/xakoxuwagukedeto.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/76740448625.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/fenoxeverinogexogulo.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/ruwavevelefavuxiviju.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_off0000ac3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3B 10832 bytes
SHA-256: 0cc5595966fac8005fc7205ceac0286f3ec80c7dda48a7ad4489267647f401d7
font_01_sfnt_off0000c51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51B 14168 bytes
SHA-256: 7de2b7b536280bb3a249834f06ceb039b72ce4f484a4f2f53bbd0071208a5f2a
font_02_sfnt_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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