Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b8c2e6107ba435…

MALICIOUS

PDF

79.0 KB Created: 2021-03-06 10:05:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb1769532f606c8becd617066f7541c0 SHA-1: e2acc230a264b7ea00c473f9dfe41d2d7b646aff SHA-256: 89b8c2e6107ba435675beffc6a28e6718ea877b3624ab8adc25e2d2c0aa1c9d6
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, many of which are likely part of a link farm designed to direct users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=cub+scout+handbook+2019
    • https://cdn-cms.f-static.net/uploads/4448991/normal_602237359f72d.pdf
    • https://cdn-cms.f-static.net/uploads/4378152/normal_602f900f9fd62.pdf
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/xuramiwajodiwukapire.pdf
    • https://nanupiwe.weebly.com/uploads/1/3/1/6/131606486/8497602.pdf
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5fff770a4688c.pdf
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/2050792.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_3808b84e678e41818eb3262593135f84.pdf?index=true
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_1ce3c653e3a946408f794a42f640c02b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e5833e60-bcd6-45ac-aaf0-01157abb80c1/7732189991.pdf
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_ddebddea83a34204bb5bc7cb567351b5.pdf?index=true
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_4d07d809fefe4c479cba5f55e6768366.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b0087687-9448-468d-ad27-665853f677ab/72514555764.pdf
    • https://uploads.strikinglycdn.com/files/bebbf8ea-a461-445d-8abe-1fc750b23650/why_is_my_keurig_leaking_water_from_the_bottom.pdf
    • https://uploads.strikinglycdn.com/files/22ddef0e-fce4-4fbf-8f1b-a6f322c5dcbe/best_calorie_counting_app_uk.pdf
    • https://uploads.strikinglycdn.com/files/bd76030a-8c3f-4aa6-b808-9fe384497d88/63818255204.pdf
    • https://uploads.strikinglycdn.com/files/b81021b0-9154-4f18-a3e4-fb00886ba352/conair_weight_watchers_scale_ww78_manual.pdf
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_464fa83a49374cdab9ef7dc4bc0daf8d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/25807a06-a76e-4e72-80b9-a5ad36a6c15b/how_much_does_an_engineering_manager_make_uk.pdf
    • https://uploads.strikinglycdn.com/files/169dcb30-09bc-42e0-8dec-fec7d0ed13b6/14535939463.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_off0000ec3e.bin
7745c9cefc2bdee8912b0b6e18b5861b53ff4e22d00dc3fe721bde0a9f482a28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 5324 bytes
font_01_sfnt_off0000fe39.bin
5bd93bdae7b482c28c10447d059e1b3f25048d745b8e8060cc1298f54a5308fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 10252 bytes
font_02_sfnt_off000120db.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 4324 bytes

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