Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaea41853b94a210…

MALICIOUS

PDF

83.3 KB Created: 2021-04-20 23:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b366b0f5d79f226465f3fea7cbbe679b SHA-1: d836865acbfe1d5813b09edec022b4ac5a78f7b6 SHA-256: aaea41853b94a21034cab09b3af507c63668416007d609a562fc3f5943d9a50d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/strik?utm_term=english+conversation+practice+near+me PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443598/normal_5ff85bddebe8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_6037f028b5d91.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/analog_clock_face.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/how_to_get_a_girlfriend_without_dating.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_606698b7f3b3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_600d0a87e8e2e.pdfIn PDF document text
    • http://wosuxetomokife.22web.org/education_as_an_ideological_state_apparatus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xilibosukotijob.epizy.com/batosama.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/7428736856.pdfIn PDF document text
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_19e4e1b92ffd43b7adadca7c3b2893cb.pdf?index=trueIn PDF document text
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_0929e2af141440c5864b9d68224168b0.pdf?index=trueIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_d1a235eb9f834dbc9b537b2551437d1c.pdf?index=trueIn PDF document text
    • http://ferodibev.onlinewebshop.net/63562205531.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_a33952c2afe84a5f8e86a0574777427e.pdf?index=trueIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_cd1451c2fc27484f85e9143120b9ab9b.pdf?index=trueIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_a4307f99a1f649468c65c8ab460c232a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loneminovu/call_recorder_pro_mod_apk.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_7976d33fde7347909cdd0e3ba07a4d2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tomaxade/25790033556.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_241bba989cef41a2a3e6ada463283894.pdf?index=trueIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_311a5387907d43dabb30979b07755f02.pdf?index=trueIn PDF document text
    • http://gulavutimomoxu.rf.gd/gumixifikebe.pdfIn PDF document text
    • http://kogopixipinal.epizy.com/pabaponatapiminapi.pdfIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_50b6137c5db644578c933360f009d24a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/81719205808.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_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 5364 bytes
SHA-256: 78439595c1a6328672e6596aa14baa9f2daa6ade60a3c833f7b866bf119a7aa4
font_01_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 10984 bytes
SHA-256: 6985621c3dcc0be4de06e1622550fcb9599028fc0cfccf30fd0338c01add4666

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