Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f0f7cc2b825544…

MALICIOUS

PDF

78.9 KB Created: 2021-03-29 06:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d60c4a246d0b3af59a6c1a4b0b977da7 SHA-1: ae4ddbcfc1c50acaf236a4c4b6625d0f0a07e7a4 SHA-256: 61f0f7cc2b825544feccbb55e7a59b9cb4a56bc0543bb55884995b758e78016e
136 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's an SEO redirector link for phishing, disguised as a free download. The embedded URL, 'https://fokemale.ru/aws?utm_term=bookshelf+drum+kit', is the primary indicator of this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/aws?utm_term=bookshelf+drum+kit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fc6a0300c200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492574/normal_5ffa44f101ee0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388271/normal_6003c29cf3982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fe3897078fd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_6035b95098651.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e402c517-f1dd-4289-8f1f-6a28e1aa59ee/why_does_my_brother_printer_say_check_connection_when_i_try_to_scan.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/11622059171.pdfIn PDF document text
    • http://milatosokalazer.epizy.com/the_case_for_a_creator_student_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/21679705269.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/facebook_app_free_for_mobile_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/halving_and_doubling_multiplication_worksheets.pdfIn PDF document text
    • http://fanevisexika.epizy.com/bensalem_township_police_reports.pdfIn PDF document text
    • http://weketabafizevu.epizy.com/76136507748.pdfIn PDF document text
    • http://todizegi.epizy.com/92781299982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f286556-def6-4bbb-83e5-856afa71b997/subtract_decimals_using_place_value_strategies.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/nedurerusudunigevojorakix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22998079-55e8-4dfc-a6c5-f5a5d466e4e3/rapuvubononeko.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/xufevi.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/magabilinap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542722c9-c26d-4b3c-878b-c3d69ca6782c/databook_naruto_volume_1_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/97595902391.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/kazebavujixadowepofejewis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c2552cf-0d23-4bb0-a80c-c8d4630cacdf/how_to_understand_gc_logs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27745bad-3ed2-41ce-9904-506a1e28c680/where_i_can_listen_to_music_online_free.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_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 5052 bytes
SHA-256: ae7e2ac104bc23518571f7d755e6c517f1bd62a01ee9ff311770059e8ac22692
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 9952 bytes
SHA-256: 16c2b482775a96a25f3519e8166c338ee431790a914d46e1d6b676483d95fa9d