Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6af78a0e487a630…

MALICIOUS

PDF

68.0 KB Created: 2021-02-08 19:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5c6462cb9e69d1d5bb56f6522cb66d59 SHA-1: 70cb1026d76f0daaca5f2c01b6a174450e99e478 SHA-256: b6af78a0e487a6304d1e6623063431947e88dbe5577db0c007b63b969d6818dc
134 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, many hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports this, indicating a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/aws?utm_term=onedrive+android+sync+pictures PDF link annotation
    • http://8gusevshop.space/1275783886ey011.pdfIn PDF document text
    • http://ximasoj.22web.org/air_datepicker_format.pdfIn PDF document text
    • http://momentshop.website/video_helper_firefox_48._07hay8.pdfIn PDF document text
    • http://instasale.company/kabaddi_project_in_marathia329c.pdfIn PDF document text
    • https://cdn.sqhk.co/salavogi/ajagdha/27075692460.pdfIn PDF document text
    • http://xuwivezotuw.22web.org/90820955160.pdfIn PDF document text
    • http://igbusinessabouthelp.com/silapapojilebazf6cpu.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/ijhcije/mololuxowapeme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470835/normal_5fc92c7d0f7cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vudatuvabejosix.epizy.com/blank_tennis_draw_sheets.pdfIn PDF document text
    • http://gugawojakopa.rf.gd/natekagiwasorogira.pdfIn PDF document text
    • http://dowupozor.epizy.com/gesture_controlled_wheelchair_project_report.pdfIn PDF document text
    • http://xivegujox.epizy.com/65157446986.pdfIn PDF document text
    • http://biwodonugawodil.rf.gd/26923295254.pdfIn PDF document text
    • http://nimoxorud.epizy.com/irregular_past_tense_verbs_worksheet_grade_4.pdfIn PDF document text
    • http://kopinakitiwodad.rf.gd/deodar_cedar_planting_guide.pdfIn PDF document text
    • http://ravuxigud.epizy.com/deflection_of_curved_beams_lab_report.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_off0000cd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD83 5224 bytes
SHA-256: 870602346addf84ad04279f921e49b11775683571e52a93661279e9ad0ee3794
font_01_sfnt_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 10460 bytes
SHA-256: 549dab645cd98a389338de4381c556c50b0ff629f20fd09c5b274cdd84c00f82

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