Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b031a608526e382…

MALICIOUS

PDF

79.1 KB Created: 2021-04-30 23:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7f1e9a7e47d292033e6e4ee7108da652 SHA-1: 2474cea110d0f2f58c208b1a176a90ffa2b16a46 SHA-256: 5b031a608526e3827fa6fb651a5ca5924f9ae5cdb9557b1827f234cdc429c6be
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to disposable hosting, disguised as free PDF downloads for various topics. The primary malicious URL identified is https://botokaw.ru/strik, which likely serves as a redirector to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/strik?utm_term=metaphysical+anatomy+pdf+free PDF link annotation
    • http://shimano-stradic.ru/61866589483ss053.pdfIn PDF document text
    • http://erethiztzj.space/types_of_drag_in_aircraftwexz8.pdfIn PDF document text
    • http://iranomics.com/troy_bilt_squall_210_oil_changel3l48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468819/normal_6064c2561344c.pdfIn PDF document text
    • http://xapizokawe.iblogger.org/bajaj_finserv_wallet_apk_apkpure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469834/normal_5ff3abeba35c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388272/normal_5fec025998ce8.pdfIn PDF document text
    • http://snail-case.store/nafujtc5mm.pdfIn PDF document text
    • http://plsale.pro/conduction_convection_radiation_worksheet_answersi2lf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_60207c8320490.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/how_to_whitewash_laminate_furnitureqlyxk.pdfIn PDF document text
    • http://milanbeach.fun/english_speaking_learning_youtube4pdkv.pdfIn PDF document text
    • http://svarka-aurora.online/the_fall_camus_explainedu3oqi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wijudog.epizy.com/bodyweight_strength_training_anatomy_free_download.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_03b8dcc9689942fcaf85d0a3555763dd.pdf?index=trueIn PDF document text
    • http://burumuniwofiri.rf.gd/plural_form_worksheets_for_grade_2.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_ed815c69952f4fed934ed548114ccd6b.pdf?index=trueIn PDF document text
    • http://pakabofenup.epizy.com/genero_no_binario.pdfIn PDF document text
    • http://solazum.epizy.com/free_house_plans_south_africa.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_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 5500 bytes
SHA-256: b60b97c73302da83abe5ca83924adb1db4c452d9268a65d3845f5ce8360f43c5
font_01_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 11188 bytes
SHA-256: a61b60ebed99757d42f486e215f49e24d7734dc2ecb1fd0ca00d9f510339a400

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