Malicious PDF — malware analysis report

Static analysis result for SHA-256 550a4e9c8dfb96b2…

MALICIOUS

PDF

95.4 KB Created: 2021-04-06 10:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03b50155147733a3011c6946cec2ecc7 SHA-1: dc621f31ca986f27def3eb53070c6d9975a5e330 SHA-256: 550a4e9c8dfb96b2ef973ef2102fd0879093397232abd868ff69e69b0da295a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://midufefew.ru/wix?keyword=wow+classic+feral+druid+abilities', which is likely used to distribute malware or phish for credentials. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=wow+classic+feral+druid+abilities
    • https://lojefumelo.weebly.com/uploads/1/3/0/8/130814401/2427435.pdf
    • https://cdn-cms.f-static.net/uploads/4412757/normal_60669520f02f5.pdf
    • https://static.s123-cdn-static.com/uploads/4470839/normal_5ff57f9ac5a33.pdf
    • https://cdn-cms.f-static.net/uploads/4469103/normal_6010f3b94c21a.pdf
    • https://joripulugafu.weebly.com/uploads/1/3/4/3/134318872/dd37dde028098ed.pdf
    • https://cdn-cms.f-static.net/uploads/4487935/normal_6038579c3a9a2.pdf
    • https://cdn-cms.f-static.net/uploads/4465545/normal_604a7e6686a5b.pdf
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/3846471.pdf
    • https://nodimawajovuri.weebly.com/uploads/1/3/4/4/134431691/suwemasatuxe.pdf
    • https://cdn-cms.f-static.net/uploads/4423431/normal_605d3752c3e11.pdf
    • https://cdn-cms.f-static.net/uploads/4423471/normal_600ee7fdedb4e.pdf
    • https://cdn-cms.f-static.net/uploads/4447874/normal_605fb63c38139.pdf
    • https://ninujesifig.weebly.com/uploads/1/3/1/4/131453022/1316524.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7feb894c-5faf-4a4b-8cd7-1da42604932a/how_to_make_an_app_on_code.org.pdf
    • https://uploads.strikinglycdn.com/files/80b61a9a-8349-487c-b98d-0ab7aa1d22e5/safewexinirina.pdf
    • http://kugesiv.epizy.com/avatar_maker_apk_free.pdf
    • http://lekakosepubu.rf.gd/15574486175.pdf
    • http://xazexunipix.epizy.com/87242846568.pdf
    • https://uploads.strikinglycdn.com/files/148ce5fc-0966-4f08-8245-4afaf885f41a/composites_are_used_in_aerospace_industry_because_they.pdf
    • https://uploads.strikinglycdn.com/files/649ad344-14b3-499c-933e-aa437efe2031/bosch_silence_plus_44_dba_error_code_25.pdf
    • https://uploads.strikinglycdn.com/files/024add7f-dfd3-4e32-96e8-915c327e73cd/depisejab.pdf
    • https://uploads.strikinglycdn.com/files/df8973a3-c4f2-40e8-8416-51202ec0026d/lista_de_verbos_irregulares_en_ingles_con_pronunciacion_escrita.pdf
    • http://durunorutap.epizy.com/jaxurofabejumipawet.pdf
    • https://uploads.strikinglycdn.com/files/4f47d69e-2b28-4a87-a110-f3915830e7c6/28473648066.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fa6.bin
0bb9111b63a46cc6738fdcedab04959c4eea1e35bf57dd55e2412d09a75a5357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 5260 bytes
font_01_sfnt_off000131b2.bin
5784675123efa4c3982010b60eb70834fc6f476366b623987f7cd3777f51ba6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131B2 11860 bytes
font_02_sfnt_off00015910.bin
2dff1fc3e5bf1049a512ca2ab3d4448021a5e4676c0c9a63fbc3d390c83797d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15910 16096 bytes

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