Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f47e572907a6fdb…

MALICIOUS

PDF

88.9 KB Created: 2021-03-23 18:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 053177ca6b09173be1647bd0fbd3c40d SHA-1: 706423f5b1a46217872cb57e4b9d7574944111c3 SHA-256: 3f47e572907a6fdbff56490222e12729080d58e0df93c369943aeed189e6a38a
166 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 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/123?utm_term=eater+of+worlds+written+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417408/normal_5ff67a6470945.pdfIn PDF document text
    • http://wide-do.top/candid_icse_biology_class_9_solutionsvnu5r.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/sodunefupexa.pdfIn PDF document text
    • https://nakaporona.weebly.com/uploads/1/3/1/4/131438848/9583717.pdfIn PDF document text
    • http://lnstagram-support.live/how_much_does_an_air_force_jag_officer_make6v8f0.pdfIn PDF document text
    • http://kmikaerfs.ru/comment_vaincre_l_anxit_de_performance601iw.pdfIn PDF document text
    • https://nemaxololele.weebly.com/uploads/1/3/5/3/135304154/5214902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495999/normal_5fdbd1869137c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_6045117637f64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_6039f9f965f6c.pdfIn PDF document text
    • http://ketadiets.site/23590485078vwlhe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498834/normal_5ffcfee879dd5.pdfIn PDF document text
    • https://bojurejid.weebly.com/uploads/1/3/4/8/134887271/kuwosogevosu.pdfIn PDF document text
    • https://rorobobadewa.weebly.com/uploads/1/3/1/1/131164171/7bee881.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tefagagegupavos.rf.gd/animal_kingdom_series_parents_guide.pdfIn PDF document text
    • http://baruluzibovog.epizy.com/56049172694.pdfIn PDF document text
    • http://sagapuxoxonigig.epizy.com/creative_problem_solving_process.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/85271533208.pdfIn PDF document text
    • http://kewivifonawati.epizy.com/bezidifonajuwowobito.pdfIn PDF document text
    • http://digupekab.rf.gd/60035466288.pdfIn PDF document text
    • http://dibulazovila.rf.gd/new_york_giants_latest_injury_report.pdfIn PDF document text
    • http://gupufodoluvasa.rf.gd/how_do_i_get_in_contact_with_planet_fitness.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/where_can_i_buy_replacement_stove_knobs.pdfIn PDF document text
    • http://doroxokile.epizy.com/vogadisazawil.pdfIn PDF document text
    • http://banigigafizaje.epizy.com/basic_life_support_guidelines_2018.pdfIn PDF document text
    • http://kalilom.epizy.com/supergrass_alright_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/charcoal_drawing_tutorial_for_beginners.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 5124 bytes
SHA-256: 18a57f51494e34ec9a275c4203feec834a371dfdbe877c00b48809fae7a370be
font_01_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 11660 bytes
SHA-256: 013b30460920cc38e565a20a3510447376382cd1c30e5af10def63c27effd609
font_02_sfnt_off00013eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EED 16168 bytes
SHA-256: fd655157fc785f451a708da758924644b09da67883332e3d6d022212841028eb