Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fbbc99c7f19b35…

MALICIOUS

PDF

83.0 KB Created: 2021-03-15 18:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 17cb9c72c36fa396fe4a166c3a205c40 SHA-1: 152fab487490ff76e9f06585f2babb45a119db26 SHA-256: a2fbbc99c7f19b35e3ad140a3dae206125bd4c5c6f108bcabe3741c19f52dbfb
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 0.9996

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://dafemum.ru/award?keyword=avanguardia+operaia+pdf PDF link annotation
    • http://sokfresh.fun/68831477762h0j4v.pdfIn PDF document text
    • http://znasila.ru/c_template_functora8z8y.pdfIn PDF document text
    • http://waliwosodumobu.iblogger.org/examples_of_interrogative_sentences_with_answers.pdfIn PDF document text
    • http://talkme-news.info/fovezawrqi2.pdfIn PDF document text
    • http://forexgeeks.net/690478338899am2.pdfIn PDF document text
    • http://olipaka.xyz/hp_photosmart_c3180_error_check_print_cartridgeo6jzz.pdfIn PDF document text
    • http://1xbet-registr.site/how_to_define_iso_27001_scopei17cd.pdfIn PDF document text
    • http://pollsexpert.com/13911089056sejx9.pdfIn PDF document text
    • http://bankrot-biznes.ru/givirisabaxh6zth.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://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_c7f7b815e9884fa989012740364ab917.pdf?index=trueIn PDF document text
    • http://sosebumi.epizy.com/nabipunamubuda.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_4ee39e9de579448589ba382e29c3f600.pdf?index=trueIn PDF document text
    • http://lavodusepigixu.rf.gd/sipepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7954cbb1-1012-48e4-80f0-919e9b775b3e/fugabipujotowusabanogope.pdfIn PDF document text
    • http://valapapiwusujeg.rf.gd/semizalateboxiburagonuji.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_0a51a53c2e1d43e5b011ddc05af2a1ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0c15d6-a188-44d0-b135-ef696bcc8115/pedudigupigozitu.pdfIn PDF document text
    • http://sazojojuw.rf.gd/how_to_pair_anker_soundcore_noise_cancelling_headphones.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_df660791b78d4c8eb07412ce3941a41e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36002de8-62ee-4dcc-9843-7b40106dfcb3/how_to_play_which_will_nick_drake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6fda739-6c98-435d-86e1-48280b2c77b1/dd_5e_character_sheet_autofill.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 4848 bytes
SHA-256: ab3d166f57d6406c5e61a3795f64d3bcc5c3fcfcef1c58dacc99ced09312b14e
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 12540 bytes
SHA-256: 25f007379f262c17f2b3dd84c31a5f46019d2976d407be7a673b03012b8050f5
font_02_sfnt_off00012f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F44 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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