Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a724371edb7ddcc…

MALICIOUS

PDF

70.5 KB Created: 2021-05-05 15:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1f15555a12be1ac363ab8f9c7e107a14 SHA-1: 01b8fae937895320fb36b95c8a532a7c9ba64274 SHA-256: 4a724371edb7ddcca9bb5424901f476a353c02c8265a8be03501393fcdf0a9e6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wb?keyword=motorola%20surfboard%20sbg6580%20all%20lights%20flashing PDF link annotation
    • https://litefobobufi.weebly.com/uploads/1/3/5/3/135326689/739610.pdfIn PDF document text
    • http://orehi-siberian-force.online/378913549217dx6l.pdfIn PDF document text
    • https://nagiliju.weebly.com/uploads/1/3/1/4/131412426/7782224.pdfIn PDF document text
    • http://creditscorecard.info/zuxapp7ton.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/dobuzuwedirg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_605a73629c0f3.pdfIn PDF document text
    • http://antonioita.fun/pibigazatiwonoketuvayjqn0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_5fd6d394de5cf.pdfIn PDF document text
    • https://norobeso.weebly.com/uploads/1/3/4/5/134586389/sexufemilejekimi.pdfIn PDF document text
    • https://zigaxedalinuj.weebly.com/uploads/1/3/4/0/134016671/0e3c185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_605ddb510d2e5.pdfIn PDF document text
    • http://latuha.com/vowokolapizugjb292.pdfIn PDF document text
    • http://bigno.space/black_leather_furniture_living_room_design_ideasu7lxo.pdfIn PDF document text
    • http://noverst.xyz/apple_pie_apk_meaningsk947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_605e1dda49568.pdfIn PDF document text
    • http://fullcreditreport.info/80616854804574cs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_8cc6764cff9a4461b7b9dc4c4bf3b8ed.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_1e3b300d288a47278e6c8c6ea4d11c8d.pdf?index=trueIn PDF document text
    • https://66547991-fb4b-492c-b271-2b6457db34f0.filesusr.com/ugd/a98e70_4a72407033194d6d842da37ec1b11e98.pdf?index=trueIn PDF document text
    • https://d6921c5e-ad40-47a8-8d28-605c6bd4eeef.filesusr.com/ugd/3306a4_42314e3bcde34d01bd1061471bcbc03e.pdf?index=trueIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_af1733b975a445f49db149655e98e781.pdf?index=trueIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_a6a00c09daf44e55afc1d9b5601ead0c.pdf?index=trueIn 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_off0000d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 5928 bytes
SHA-256: 142154c1fe618cb4775d14f90036fc013bfc41918b529a2b6a0777507d7770ba
font_01_sfnt_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 10420 bytes
SHA-256: 68a6c22303e1e1d37d243dd89de5e1f8e87aa2b78e98ae26a9a52905b508b62e