Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1816d31c42ccf1…

MALICIOUS

PDF

72.2 KB Created: 2021-05-23 20:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 846252b0799c6d4a0dd04ed0bce1d0a1 SHA-1: d72e1b6a0c6e7e4cc50893b99ea9551ebc73d738 SHA-256: 4e1816d31c42ccf1063a5235443c1fd850ee94a23a6d5f06c9e8b585adc0a179
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL, https://fokemale.ru/strik?utm_term=how+to+use+hisense+remote+control, is the primary indicator of compromise, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/strik?utm_term=how+to+use+hisense+remote+control PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d2120b-7d9b-4e57-a12d-218c1882cf98/sijobexiwuduwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f7a5a0-d9ad-4c00-92ab-f89bf28a09ff/635849335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b64cc58-f656-4a7d-9c3d-aaec289f851f/vipazudej.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/nomuvagikorepesufukiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/672e93f9-6061-4acf-9e80-2bebea355b02/is_the_garrett_ace_400_waterproof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beac2d05-0aaf-4c31-9140-6d201b14e777/bixomirowifutirejowodude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5cb6d43-dedf-4cc7-ac6e-01fc319cdad9/adobe_premiere_pro_cs5_free_download_for_windows_7_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b69842b-f08f-48de-97b1-bcd53b10b99d/cuisinart_coffee_grinder_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd22bbd-3ffc-4b1a-8beb-b14063354aa1/16635235774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0f95a8-8add-4779-a891-101bf280284f/41102913894.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/baidu_browser_for_android_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1792b9d-8869-461b-84e6-eebedd38ce31/84828823407.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/totipatimavisonefeje.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/36420811380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8117e5f-7144-4eb2-a26d-4f50853f18d7/45226487433.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/kelewekamuzoder.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/multivariate_logistic_regression_analysis_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/gubufixejumefebebo.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/jai_parsuram_jai_bhumihar_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b36b55c-dd3a-4e8d-b522-f52c31a37fd7/pujadanekanilirowigalib.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 4880 bytes
SHA-256: 5f730e65ba4e386c91e463ab8becf3351cd14e2bdaddceff1717a4a055c93212
font_01_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 10600 bytes
SHA-256: 934661e69057382d25cd052fdf27becc3320a2bd09ec3560d0835f34eef01c42