Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6737cab2c10374c…

MALICIOUS

PDF

129.4 KB Created: 2021-05-24 15:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 367650e135732305ba1470374708a787 SHA-1: 43d1555dbc134bffd5a1934e91996e826579020e SHA-256: e6737cab2c10374ced80cdbdecad6bbb2e432b14a0fbcf62ebcd1b6ce084f0c3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=diagn%25C3%25B3sticos+de+enfermer%25C3%25ADa+nanda+pdf+2018. This behavior is consistent with phishing or malware distribution campaigns that leverage link farms to obscure the final malicious destination. No scripts were extracted, but the structure and URL patterns strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://midufefew.ru/strik?utm_term=diagn%25C3%25B3sticos+de+enfermer%25C3%25ADa+nanda+pdf+2018 PDF link annotation
    • https://dupukaradox.weebly.com/uploads/1/3/6/0/136015529/8ecd2aa264da5.pdfIn PDF document text
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/2284468ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_604917277ffc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fd2d7e71da6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454170/normal_60445c79a85a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423133/normal_605b0c981da08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465000/normal_60489f3beccec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_5fe63d3a154c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_5fe3e777b3284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489412/normal_6007d4a7b81cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_603bf5e9ecdfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485810/normal_6020a3a6cbbe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_602282e984caa.pdfIn PDF document text
    • https://bogonifad.weebly.com/uploads/1/3/4/1/134108647/rupib-betowuvopokusu-divisifowefig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_602c740f355cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_6067cb798b73d.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/2048899.pdfIn PDF document text
    • https://roribevewo.weebly.com/uploads/1/3/4/5/134502196/piderumivuwoda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37625a6f-4e2e-4a42-bcec-14874f952089/jepexelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e878384b-c78c-41dc-8a8d-f7b95ad78857/zojepovuvovuvubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f162eb5a-3b51-4d2f-95c4-557581cebb07/romeo_and_juliet_act_1_scene_4_main_events.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09711a4-81df-40ce-957e-eecbe52fe217/vodixoj.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/99135409066.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/gixenozudedututejuxefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e08ced54-ceae-4ec7-a6e3-264b2a965c5f/migozil.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B846 6152 bytes
SHA-256: 41fb210dcdbf0886a019b3e1172fdb5750edff2ecf4f321f4e07417c6de81bc9
font_01_sfnt_off0001ccf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCF0 12720 bytes
SHA-256: fc731d86a5c20e6b4851f0aca7d080d86824f965c230ac80fee2b29f7f50be0a

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