Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef742b2e7895a850…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 00:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ceb9b10c87d4d65ea8e2e3cbfe6a2f56 SHA-1: 1f254a12163103d214147e2244099bba559f56f8 SHA-256: ef742b2e7895a850004ca8f2a4ad9669530ec4668028e2d3092e05d4287e373a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and its classification as a link farm on disposable hosting strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely involving the redirection of users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=alto%27s+adventure+apk+download PDF link annotation
    • http://eskuvoiiranytu.hu/blog/file/54812827422.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/sobofavopufefaxa.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/desakegiwirevekorasem.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a72118257---wipesumuwo.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/51627027322.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/legibuveri.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/64676662629.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/60519884422.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2a65f8d4---vepidivetogujusug.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/89415749448.pdfIn PDF document text
    • http://ashioke.com/images/library/File/zijosu.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210918111902828621g8ckk.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109111610516496.pdfIn PDF document text
    • http://master-vin.ru/files/file/kawasiwo.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/falexivexifojuf.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/lukafubojarifozolivojem.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/4900683809.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/kumimedimeliwiweruvesena.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/40036010887.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/parowelafeg.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/44628543561.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/68830924993.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/44573225183.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_off0000d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 10652 bytes
SHA-256: 239f4562f55730a8100e99d31a1d951432f010b97033e1d26f1d762743f950f5
font_02_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 18892 bytes
SHA-256: 8ff6fc6f49d09b5aeb3358c021183426e535c03b9dbede4b951be69b8da38b87

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