Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dfbc76c0ad3563…

MALICIOUS

PDF

102.1 KB Created: 2021-05-05 13:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 91cd1b713d7b3a02241f3541aeacee80 SHA-1: 176003b620f1b19b113a92a778e7777224ac6428 SHA-256: 45dfbc76c0ad3563271f6cd1137b24ada767921abbad13eb0b8396ed361fd838
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to 'https://resalured.ru/strik?utm_term=sas+ods+rtf+style+template', which is likely used to redirect the user to a phishing or malware-hosting site. The PDF also exhibits characteristics of a link farm, further supporting its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://resalured.ru/strik?utm_term=sas+ods+rtf+style+template PDF link annotation
    • https://cdn.sqhk.co/sunomedude/gtijQgg/54459568542.pdfIn PDF document text
    • http://1-bog.ru/20613855853aj60d.pdfIn PDF document text
    • http://makeyourself.xyz/herbal_essences_color_me_happy_conditioner_ingredients15fua.pdfIn PDF document text
    • http://vovejarime.iblogger.org/xuget.pdfIn PDF document text
    • https://cdn.sqhk.co/danexili/dMghjfj/31310648471.pdfIn PDF document text
    • http://gagerovovus.22web.org/kedodixagovajekejaf.pdfIn PDF document text
    • http://digitalmicroteter.xyz/vidojagivutokojiridurabib57xjg.pdfIn PDF document text
    • https://cdn.sqhk.co/manaruparil/vBjc8bn/85819399868.pdfIn PDF document text
    • http://tifimazupidad.iblogger.org/log_antilog_amplifier.pdfIn PDF document text
    • https://cdn.sqhk.co/vikimono/fYyjbKj/raxukalel.pdfIn PDF document text
    • http://yoganchik.space/92271934255k6tii.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://uploads.strikinglycdn.com/files/b04db091-9a81-4a97-b0c3-00222581a442/diwevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708b3526-7c0e-48bd-9d67-391e3f8cc8af/how_to_make_someone_fall_back_in_love_with_you_again.pdfIn PDF document text
    • http://xaramoturowuf.rf.gd/crisis_dolorosa_anemia_falciforme.pdfIn PDF document text
    • http://nerelikeg.epizy.com/babul_de_vehre_song_mr_jatt.pdfIn PDF document text
    • https://4228e3e8-6e56-436b-9c2a-5710a6c3a216.filesusr.com/ugd/e32dc8_903e492882694f26871a0f3a4b1d7c66.pdf?index=trueIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_f7af647f3b0f419686ea64ea142c3ef5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8485a7d-00f4-4d09-a20a-1c748228a5fa/zunodudunupa.pdfIn PDF document text
    • http://xixujoteb.epizy.com/dakovajovaxikumisanoro.pdfIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_df2e86e5d5c1480fb3925be0b6a2cb93.pdf?index=trueIn PDF document text
    • http://pijedawometuzov.epizy.com/cynicalex_uniform_tier_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac22ec6f-4244-4d56-a6d9-59418f9c8feb/katox.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_fa306db00d5c452d8a02bbb81da7cd37.pdf?index=trueIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_4f9104a63eac4b1e99ef11eaceefaaad.pdf?index=trueIn PDF document text
    • http://lanadofebanubod.epizy.com/surah_mulk_with_urdu_translation_mp3_free_download_qari_abdul_basit.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_off00014298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14298 5024 bytes
SHA-256: 559f5323750b7a0aca0af859d224dad778cc6d2e7cb19479799af5cf7484b6c6
font_01_sfnt_off000153b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B2 11856 bytes
SHA-256: fd93249038150f91dbd15ac202c5c236631fd7a9300e48e626052527abd796f6
font_02_sfnt_off00017c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C2C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34