Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ae54883c4beac6…

MALICIOUS

PDF

79.6 KB Created: 2021-04-28 15:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a700f931c4c2ef69154e24e6819724e6 SHA-1: 109232a2492ba23f9211091e938e8c754c5e2b46 SHA-256: f8ae54883c4beac68db07d7fd79409c1308e0212ef027c5a7754a7901285dde5
126 Risk Score

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-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://crophysi.ru/strik?utm_term=sat+qas+tests+pdf PDF link annotation
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/bixuregot_fexawimafi.pdfIn PDF document text
    • http://dibosezufo.getenjoyment.net/hombres_en_guerra_alvah_bessie.pdfIn PDF document text
    • https://rarerosedipise.weebly.com/uploads/1/3/4/8/134876587/lematisegibago-gatiteveb-folozagigavivep-sutozividuse.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/bamasepebidulomopuk.pdfIn PDF document text
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/nufogojifo.pdfIn PDF document text
    • http://kisizifavo.getenjoyment.net/cracking_the_money_code_download.pdfIn PDF document text
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/accbd.pdfIn PDF document text
    • http://jixusigelabewe.iblogger.org/3_phase_induction_motor_wiring_diagram.pdfIn PDF document text
    • https://zodazapel.weebly.com/uploads/1/3/4/5/134511258/fekumumenotagunuduko.pdfIn PDF document text
    • http://mamimufexaliro.66ghz.com/59597295939.pdfIn PDF document text
    • http://xeberok.getenjoyment.net/weldability_of_aluminium_alloys.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/99764266408.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/8bc975482.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gopifu/watod.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/99910216263.pdfIn PDF document text
    • http://lufiwivumijej.myartsonline.com/carpal_tunnel_syndrome_patient_education.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/basic_biochemistry_laboratory_manual.pdfIn PDF document text
    • http://bozexobasunuz.rf.gd/pre_algebra_review_worksheets.pdfIn PDF document text
    • http://gedalexi.rf.gd/simcity_4_tips.pdfIn PDF document text
    • http://nuzavaxevarap.epizy.com/xorotejojoniwevejib.pdfIn PDF document text
    • http://dejibokakar.onlinewebshop.net/medicinal_chemistry_mcq_book.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_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 5136 bytes
SHA-256: a431d30c17188f64b8c1f7d55bcfd4d4992ad7c05c2e09a54b4cc733b04c4ce1
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 1964 bytes
SHA-256: 1d18534733479c870a78c46a90b83ed8aff410c3511f6838c5b83347f92bfa48
font_02_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 11256 bytes
SHA-256: 9f69f850d0f5bf83cd8ccbc04fd86c43de629c2295302ab0f7a21bc5c2844366

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