Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7ce07484ccd7fa…

MALICIOUS

PDF

110.2 KB Created: 2021-03-27 20:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7ee413a5808a3812657556951830729 SHA-1: 2e335ffe35700b4a563f276519da7ae25dbf881b SHA-256: ff7ce07484ccd7fad3ccb7b92949201fd8e618426a951230b63f524f79f4354d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including a suspicious URL hosted on 'midufefew.ru', suggests a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'Diagnostico de anemia pdf', which is likely a lure to entice users to click on the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=diagnostico+de+anemia+pdf
    • https://cdn-cms.f-static.net/uploads/4373797/normal_600cf3e5696e1.pdf
    • https://cdn-cms.f-static.net/uploads/4409607/normal_60370f3846d0a.pdf
    • https://static.s123-cdn-static.com/uploads/4503050/normal_5ff4c2cc3980d.pdf
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/c8da92a678ad.pdf
    • https://cdn-cms.f-static.net/uploads/4456114/normal_6032ac61dc442.pdf
    • http://nopuvobetag.mygamesonline.org/xejawa.pdf
    • https://xoniruzi.weebly.com/uploads/1/3/4/8/134869292/46ef8.pdf
    • https://static.s123-cdn-static.com/uploads/4450864/normal_6000e637672fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_6ff4b5b401144e608004d95675ad06c2.pdf?index=true
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_7c872f2d1e7d4bf698664bb171d2d05f.pdf?index=true
    • https://s3.amazonaws.com/xofalepelala/sparkle_app_instagram_android.pdf
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_0bc78cab95334ae5bf9c2fa12aba7c21.pdf?index=true
    • https://s3.amazonaws.com/ravuxudibure/how_do_you_start_a_paragraph_sentence.pdf
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_986b8e07272a49309f5d130cbf533eef.pdf?index=true
    • http://juborekif.atwebpages.com/clinical_biochemistry_mcqs.pdf
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_89fbc34c54f1444392e74d7c825378c2.pdf?index=true
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_b406cf0518c44b84893095c09681560a.pdf?index=true
    • https://s3.amazonaws.com/nefunupu/divewirimugilonaga.pdf
    • https://s3.amazonaws.com/xugigabitulu/84242675331.pdf
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_c8331b5437464099b86a9ea08a184c24.pdf?index=true
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_33d9fd6ba5e647c290d688fc5af171f7.pdf?index=true
    • https://s3.amazonaws.com/jaxesabi/tales_of_zestiria_guide.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001638e.bin
1e4f07f3fe7ebc5b99682f608995d73704b062dd1cd97bf627d0fec4f076ca80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1638E 5136 bytes
font_01_sfnt_off000174f7.bin
121d41bcbfa5516b9dc12640c00996adb5ce9aa84042cc9c5e8a442d7bce0c3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174F7 11812 bytes
font_02_sfnt_off00019bc1.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19BC1 4324 bytes

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