Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8bd325c65c38ac…

MALICIOUS

PDF

74.6 KB Created: 2021-03-25 22:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e238fda0a67795132b85d65e25f0a5c8 SHA-1: b267c5409dbd09be60464d23d1724ef1e451efe8 SHA-256: 9b8bd325c65c38ac22aea31c23b66c504f0cdcb57380a09da473b54dd3aa0202
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The presence of a PDF_SEO_UTM_REDIRECTOR_LINK heuristic indicates a phishing lure disguised as a free download. The embedded URL, https://jacksth.ru/123?utm_term=how+to+teach+report+writing+to+students, likely serves as the initial redirection point for this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/123?utm_term=how+to+teach+report+writing+to+students PDF link annotation
    • http://fitokapss.xyz/37078532560k309e.pdfIn PDF document text
    • http://conicppjry.bid/14039474798o5dzb.pdfIn PDF document text
    • https://xuxijewurinawux.weebly.com/uploads/1/3/4/6/134699439/xerawamisowuve-lazilamovo.pdfIn PDF document text
    • http://edaruzal.xyz/crab_clipart_template8q8na.pdfIn PDF document text
    • https://ralerafuzirepob.weebly.com/uploads/1/3/4/3/134386916/2673035.pdfIn PDF document text
    • http://uabiomanix.xyz/what_is_the_meaning_of_marginalized_groupscswxe.pdfIn PDF document text
    • https://midejunefe.weebly.com/uploads/1/3/5/4/135400465/julifidugoju-mejax-negevo-zigevavapoza.pdfIn PDF document text
    • http://jalosus.mygamesonline.org/77207538563.pdfIn PDF document text
    • http://vbnmcxz.xyz/90095068605om6kx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/free_lagu_xaluna_ambyar.pdfIn PDF document text
    • http://wupomadupu.epizy.com/60931842200.pdfIn PDF document text
    • http://jaweratiz.atwebpages.com/camilla_lackberg_carti.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/why_did_boardwalk_empire_get_cancelled.pdfIn PDF document text
    • http://xarajadumep.epizy.com/jovofomibudaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca27b4a-d474-4ccd-91e6-d6e683be32fb/basic_soil_mechanics_lecture_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1d82a0-458b-4f25-9352-82aa89afa878/grade_1_english_workbook_sri_lanka.pdfIn PDF document text
    • http://dolifusekaxug.epizy.com/windows_7_kms_activator_software.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/what_is_group_theory_in_politics.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/bpsc_answer_key_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e043fbf9-ed4b-4a82-a1bb-b11373ea2462/95346837684.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/banner_vector_photoshop.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_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 5356 bytes
SHA-256: c4e8b305265e7dbea3e42bf3bd8cca6ecd5cf3faee867cbe6f20139a5a1e7dd6
font_01_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 10944 bytes
SHA-256: 00b2349a1d0dc90b4f43100a098848241453239386fb9978fb77d3cd6d1794ec

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