Malicious PDF — malware analysis report

Static analysis result for SHA-256 6235b13db709ba4e…

MALICIOUS

PDF

73.8 KB Created: 2021-04-06 11:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c29bd427c53b397a826538ebf3ddadd6 SHA-1: 488d0fa1c263a3c24291267535bdc53f0f4c88fd SHA-256: 6235b13db709ba4e37f86b0d7877a79933f5a1d859f2d62f006fcb5631119b5a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://botokaw.ru/award?keyword=sql+queries+for+practice+with+answers+free+download+pdf PDF link annotation
    • http://zasoremejoka.iblogger.org/56007939938.pdfIn PDF document text
    • http://gijipodotetojo.22web.org/mass_effect_andromeda_eos_map_guide.pdfIn PDF document text
    • https://gawokani.weebly.com/uploads/1/3/5/9/135993895/gesizebadibus.pdfIn PDF document text
    • http://remontnatali.ru/foporuxofijikigepaxatema53udo.pdfIn PDF document text
    • http://nixuvukoda.iblogger.org/exam_questions_and_answers_on_macbeth.pdfIn PDF document text
    • https://xoruvuxana.weebly.com/uploads/1/3/2/6/132696063/sikalerodo-goxatexopufuw.pdfIn PDF document text
    • http://amsidisi.xyz/guzefugadesit4lpf.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/30d7a.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/aa0a521d-3de6-4bfe-a215-8daa2fa32257/how_to_empty_dyson_small_ball_vacuum.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/60154829545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8adc57b6-f572-4377-8d29-ccbaf150675a/what_is_a_synonym_for_touchable.pdfIn PDF document text
    • http://xanagenijumujoz.epizy.com/1498343088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0166d6c8-2f98-45e1-8edc-25eeebc5fc50/offender_screening_tool_scoring.pdfIn PDF document text
    • http://xawazemekize.epizy.com/jesus_oh_what_a_wonderful_child_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/18716533664.pdfIn PDF document text
    • http://satanomoxa.rf.gd/minecraft_1._8_free_pc_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f56d02-85e5-4c5e-8318-a9b2428efe78/critical_state_soil_mechanics_andrew_schofield_and_peter_wroth.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_off0000dbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 5564 bytes
SHA-256: 67273094b7107135e5e61a4690248e6e439cf40badc5fc294755fe7f4ad4f30f
font_01_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 12004 bytes
SHA-256: d3b08e4bcb42e3417396db8f75a1a908729d40e66e5993c5e6b83e48be586b9f

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