Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7074889c7a66c1a…

MALICIOUS

PDF

73.6 KB Created: 2021-02-14 04:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e189f620b15c1f65a08670f5187ff41c SHA-1: c4bcf50305ee0c5a9e6ce47a6613cb55022c2438 SHA-256: b7074889c7a66c1abd2f9b5e5d0943af24fe8af4818b65283c6abb8e4ee6eaf7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on suspicious domains or are part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/aws?utm_term=english+alphabet+colouring+pdf PDF link annotation
    • http://lnstagram-blue-badge-form.com/35878739539lalav.pdfIn PDF document text
    • http://santecmb-sarl.com/sidifixusin6lpgx.pdfIn PDF document text
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/4480611.pdfIn PDF document text
    • https://vubinejenifa.weebly.com/uploads/1/3/4/4/134444695/c882f630.pdfIn PDF document text
    • http://carbackseat.site/10075909875wrbjr.pdfIn PDF document text
    • https://kufojinelimipi.weebly.com/uploads/1/3/0/7/130776518/5761216.pdfIn PDF document text
    • http://tosety.xyz/69389935705dwkqp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/15846291410.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/commercial_lease_assignment_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/minecraft_earth_uptodown.pdfIn PDF document text
    • http://zosejanukapub.rf.gd/zitetetunokexodufuvifuke.pdfIn PDF document text
    • http://vobujubiga.epizy.com/tuneruke.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/boy_scout_uniform_patches_location.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/free_radio_broadcast_software_to.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/satujezixuxebegebefuxoj.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/odia_new_movie_song_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/drug_induced_agranulocytosis.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/ethnographic_study_example.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/8743814410.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/cisco_catalyst_2960x-_48ts-_ll_datasheet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 5396 bytes
SHA-256: 0eaf0b72d36cb1e2cf766bbc568ef82fdb50427ce48ea21ada6c756c61a9606e
font_01_sfnt_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 11012 bytes
SHA-256: 749ab627380afa7d35fe3bd306aca96208ade2e01a597ffd4a8a600ac6251983
font_03_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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